Cold Equations by X Minus One

Summary

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Relic Radio Sci-Fi: "Cold Equations" (X Minus One)

Podcast: Relic Radio Sci-Fi
Episode: Cold Equations by X Minus One
Date: September 29, 2025
Host: RelicRadio.com

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Episode Overview

This episode features the classic science fiction story "Cold Equations," adapted from Tom Godwin’s iconic tale and aired originally on the "X Minus One" radio program. The episode follows Emergency Dispatch Ship (EDS) pilot John Barton as he faces an agonizing moral and scientific dilemma: the presence of a stowaway endangers his mission to deliver life-saving serum to a fever-stricken crew on a distant planet. The narrative explores the inexorable rules of physics, the absence of mercy in space, and the heartrending human costs when sentiment collides with immutable law.

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Key Discussion Points & Insights

1. The Setting and Stakes

• The story opens with the setup: Barton is tasked with delivering a vital serum to a survey team on Woden, a remote planet in the Crab Nebula, where a fever outbreak threatens several lives.
• The EDS is loaded with precisely enough fuel to complete the journey, with no margin for error or excess weight.

2. Discovery of the Stowaway (05:28)

• Barton notices abnormal heat in the supply closet, only to find Marilyn Lee Cross, a stowaway hoping to reunite with her husband on Woden.
• Marilyn’s motives are innocent, driven by love and longing:

  “I wanted to see my husband. He’s with the government survey crew on Woden. I haven’t seen him since he left Earth four years ago.”
  <span style="font-size:smaller;">— Marilyn Lee Cross, [05:38]</span>

• She does not understand the gravity of her actions, at first assuming she will simply pay a fine.

3. Implacable Physics and Grim Calculations (06:10–14:00)

• The episode emphasizes that in space, even a minor addition to a ship’s mass dramatically impacts its fuel requirements:

  “H amount of fuel will power an EDS with a mass of M safely to its destination. H amount of fuel will not power an EDS with a mass of M+X safely to its destination.”
  <span style="font-size:smaller;">— Barton, [06:10]</span>

• Barton appeals to his commander, but regulations and the laws of physics leave no leeway.
• The computer calculates Marilyn’s remaining time: one hour.

  “She has one hour to live.”
  <span style="font-size:smaller;">— Barton, [14:00]</span>

4. Confronting Mortality and Regret (14:00–17:01)

• Marilyn and Barton engage in personal conversation. She grapples with disbelief and then sadness at her fate:

  “All I did was hide in a closet. Now you tell me I have to die? I don’t believe it.”
  <span style="font-size:smaller;">— Marilyn, [14:03]</span>

• Barton reveals his own romantic disappointment, creating a shared sense of melancholy and lost opportunities.

5. Final Messages and Heartbreaking Goodbye (16:54–21:58)

• As they near Woden, Barton offers to help Marilyn speak to her husband, Jerry, via radio.
• The brief, emotional exchange is a poignant high point:

  “I wanted to see you again. I stowed away on the EDS … all that matters is that I can tell you all the things I’ve kept inside for so long. Jerry, I want you to know I’ve never forgotten.”
  <span style="font-size:smaller;">— Marilyn to Jerry, [20:04]</span> “Hate you? Marilyn, I’ve never stopped loving you. Not for an instant.”
  <span style="font-size:smaller;">— Jerry Cross, [20:23]</span>

• Their communication cuts out as radio contact fails, leaving only memories and unresolved longing.

6. The Cold Equation is Balanced (22:07–22:35)

• Resigned, Marilyn faces her fate:

  “I’m ready.”
  <span style="font-size:smaller;">— Marilyn, [22:30]</span>

• Barton sends her to her death, and the ship’s controls return to normal. The cruel necessity of the act hangs over the end of the episode:

  “A cold equation had been balanced, and I was alone in the ship.”
  <span style="font-size:smaller;">— Barton, [22:35]</span>

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Notable Quotes & Memorable Moments

• On Space’s Harsh Realities:
  “There is no margin of safety along the rim of a frontier ... The penalty for mistakes is a grim one.”
  <span style="font-size:smaller;">— Opening narration, [00:35]</span>
• On Law, Emotion, and Fate:
  “If you were only a thief or spy, it would make it easier.”
  <span style="font-size:smaller;">— Barton to Marilyn, [08:34]</span>
• On Helplessness:
  “It’s different here. Different from anything you’ve ever known ... You can only make a mistake once.”
  <span style="font-size:smaller;">— Barton, [11:44]</span>
• On Death and Memory:
  “Maybe I’ll come to see you again … maybe I’ll come to you in your dreams … maybe I’ll be nothing you can see or hear, but you’ll know I’m there.”
  <span style="font-size:smaller;">— Marilyn, [21:29]</span>

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Key Timestamps

• Discovery of Stowaway: [05:28]
• Explaining the Situation to Marilyn: [10:17]
• Computer Calculates Time Remaining: [14:00]
• Radio Contact with Jerry Cross: [19:35–21:28]
• Marilyn’s Farewell & Airlock Sequence: [22:07–22:35]

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Final Thoughts

"Cold Equations" remains a seminal story in science fiction, confronting the audience with the brutal, non-negotiable logic of survival in space. The episode’s adaptation via "X Minus One" delivers a tightly crafted radio drama, with affecting performances that drive home the emotional and ethical weight.

Listeners are left to consider: What would you do faced with a cold equation, where the outcome means life for some and death for another? The episode lingers as a meditation on responsibility, mercy, and the unyielding laws of nature.

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Transcript

[A]

Relic Radio.

[B]

This is Relic Radio. Sci Fi Old Time Radio Science fiction stories from relicradio.com Countdown for Blast Off. X/5. 4. 3. 2. X minus 1. Fire. From the far horizons of the unknown. Come transcribed Tales of new dimensions in time and space. These are stories of the future. Adventures in which you'll live in a million could be years on a thousand maybe worlds. The National Broadcasting Company in cooperation with street and Smith Publishers of Astounding Science Fiction presents. Heck. Heck. Heck. Heck minus one. Tonight's story called Equations. There is no margin of safety along the rim of a frontier. There can't be any until the way is made for those who come later. Until then. The penalty for mistakes is a grim one. The laws of physical nature operate with irrevocable certainty with no room for mercy, kindness or sentimentality. In space, life becomes a cold equation. And the equal sign is often followed by death. I know. I'm the pilot of an eds. Come in. You set for me, Commander? Yes. Sit down, Barton. We just got an ed from the territorial space station on Woden. Woden? That's in the Crab Nebula, isn't it? That's right. There are two exploration parties there on Manning's continent. Eight men each. They've got cala fever in one of them and no serum. Oh, and I thought this was going to be a nice quiet passenger run. Computers are working out your payload and your course right now. In exactly 10 minutes, we'll drop in a normal space and launch your ship. I'll get her ready. One thing. What's that? Woden is at the maximum pay limit for an eds. Figuring the weight of the serum will be able to give you just enough fuel to land on Manning's continent if you make it the first pass. Otherwise you'll burn out in midair. Standard procedure. Report to launching control. Right. Good luck, Barton. Thanks. Oh, by the way. Yes? When can I expect to be picked up? We'll make a stop on the run back to Earth sometime next year. You'll be notified by radio. Okay. Sorry we can't make it sooner. That's what happens when you sign on for EDS work. I'll see you next year, Commander. Down in the belly of the stardust, the crew was working like beavers to get the eds the emergency dispatch ship ready. Mechanics and technicians were swarming all over the place. Girls in inspectors uniforms were checking the gauges in the supply cabinets. Nine minutes later, the exact course was in the computer. The serum was stowed in my supply cabinet Closet and Little Eds 4G3 was ready to be born into space, Martin? Yes, sir. 30 seconds to blast off. All set? All set. I'm turning you over to traffic. Ready, Traffic control. Come in, EDS. 4G3 ready. 20 seconds. Lock open. 15 seconds. Space drive on. Space drive on. 10 seconds. Gravity neutralizer on. Neutralizer on. 5 seconds. 4, 3, 2, 1. Blast off. I don't remember how long it was afterwards that I first noticed something wrong. Maybe an hour, maybe two. There was nothing to show it except the needle and the heat gauge. It was on zero when we left the Stardust. And now I noticed that it had crept up toward the 30 mark. That meant something inside the ship was radiating heat. That something was in the supply closet. And it was alive. All right. Come out, whoever or whatever you are. If you don't come out in five seconds, I'm going to blast you. One, two. Well, I'll be.

[A]

Hello. I'm Marilyn Lee Cross.

[B]

What are you doing in there?

[A]

I'm a stowaway.

[B]

Oh, my.

[A]

What's the matter? Do I have to pay a fine or something?

[B]

What are you doing here?

[A]

I wanted to see my husband.

[B]

Who's your husband?

[A]

He's with the government survey crew on Woden. I haven't seen him since he left Earth four years ago.

[B]

Okay, but what made you hide in my eds?

[A]

I have a job waiting for me on Mimir. But I heard you were going to Woden, and there was plenty of room, so I hid. Oh, I knew I'd be breaking some kind of rule. But what's one little rule?

[B]

What's one little rule? H amount of fuel will power an EDS with a mass of M safely to its destination. H amount of fuel will not power an EDS with a mass of M +X safely to its destination. How could she be expected to know she was five two with brown curly hair and the faint sweet smell of perfume? She was 52 and she smelled like apple blossom. And her name was X in an equation that would have to be balanced. Stardust. Come in, EDS. Come in. This is Barton, emergency dispatch. Pilot 4G3. Go ahead. Give me Commander Delhart. What's the message, EDS? I have to consult Commander Delhart. The commander is busy. Listen, you squirt. Give me Commander Delhart. One moment. 4G3. Commander Delhart, emergency message from ETS. 4G3, this is Delhart. What is it? At 0800 hours, I discovered a stowaway aboard my ship. Stowaway? Yes, sir. Well, have you notified ship's records? Not yet, sir. You know the regulations as well as I do. Of Course, I know the regulations. That's why I'm called. What's going on? Sir, this is a girl. A young woman. Oh. She wanted to see her husband on Woden. She didn't know what she was doing. I see. I wondered, sir, maybe the cruiser could change course or something. I'm afraid not. We're hundreds of light years apart now. We have a limited fuel supply ourselves. Is there any chance. No. Okay, skipper. Better get the information to ship's records. Okay. What? Skipper, I'm sorry. Yeah, sure.

[A]

You got our acceleration, didn't you?

[B]

Yes.

[A]

Why?

[B]

Well, save fuel for a while. How did you manage to stow away?

[A]

I was taking a language lesson in memories from a girl in the inspection corps. The order came in for your trip. I just went along on an impulse. It was easy. I'll be a model prisoner, I promise.

[B]

If you were only a thief or a spy, it would make it easier.

[A]

Make what easier?

[B]

Forget it. Why couldn't she have been somebody with some ulterior motive? A fugitive hoping to lose himself in a raw new world at the crackpot with a mission. Why did she have to be a woman? A beautiful, kind, trusting woman? Stardust Barton. EDS 4G3. Go ahead, 4G3. Identify Stowaway. Give me your identification disc, Mrs. Cross.

[A]

Here. Why?

[B]

Well, it's for ship's records. Identification number T8374. One moment. This is for the gray card, of course. Yes. I'll need the timer. I'll tell you later. That's highly irregular. Then we'll do it in a highly irregular manner. The subject is a young woman. She's listening to everything that's said. Are you capable of understanding that? Oh. Go ahead, 4G3. Number T8374Y54. Name, Marilyn Lee Cross. Female. Married. Born July 7. 4160. Good Lord, you're only a child. Height, 5ft, 2 inches, weight 110. Hair, brown, eyes blue, complexion light. Blood type O. Original destination, Port City, Mimir. Listen, I'll call you back later.

[A]

Look, Miss Marilyn.

[B]

Look, Marilyn, I guess you don't know what you got yourself into here. Well, it's like this. This ship is carrying Cala fever serum to the survey group on Woden. Yes, their supply was wrecked in a tornado. The fever is always fatal unless the serum is given in the first 48 hours. Now, these little ships have exactly enough fuel to reach their destination. If you stay aboard her, your added weight will cause it to use up all its fuel before it can land.

[A]

What happens then?

[B]

We crash you die, I die, and six fever victims on Woden die.

[A]

Can't they send out another ship to meet us?

[B]

There are no ships to send.

[A]

Well, I know. Oh, no. You. You couldn't do that.

[B]

That's how it has to be.

[A]

But that's crazy. I haven't done anything. I. I haven't heard anybody.

[B]

I'm sorry. I should have told you before, but I wanted to make sure there was no other way.

[A]

You mean it? You're gonna make me leave this ship?

[B]

That's how it is.

[A]

But I'll die. I'll explode. I'll be like those horrible people. Pictures of a.

[B]

Try to understand.

[A]

I do understand. You're going to kill me and I didn't do anything.

[B]

I know you didn't. I know you didn't. That has nothing to do with it.

[A]

It has everything to do with it. Nobody just dies like that for no reason. Oh, listen. Maybe there are other cruisers. Cruisers you don't know about. Maybe the radio. Maybe it.

[B]

Now, listen to me. It's different here. Different from anything you've ever known. On Woden, there are 16 men. 16 men on an entire world they're fighting. Fighting an alien environment. The environment fights back. You can only make a mistake once.

[A]

I made a mistake?

[B]

Yes.

[A]

There's no hope.

[B]

Absolutely none. You'll have to be put out of the ship. It was better so. With the going of all hope would go the field. Then would come the resignation. She needed time, and there was so little. Eds Starship to EDS need pertinent data. All right, Starship. When do you expect to complete your report? I. I need a computer check. I'll give you statistics. Statistics. This is EDS4G3. I'm intersecting. Course vector 7.3 at 0831. Deceleration 1750. Weight one ton. I would like to stay at point 10 as long as the computers allow. Will you give them the question? Jack, I'll call you back. We wouldn't have long to wait. The new factors would be fed into the steel maw of the computer bank. And the electrical impulses would go through the complex circuits. Here and there, a relay would click a tiny cog, turn over. But it would be the current, formless, mindless, invisible, which would determine with utter precision how long the pale young girl beside me would live. Five little segments of metal in the second bank would trip against an inked ribbon. And the machine would spit out the answer. You will resume deceleration at 1910. It was 1810 when he spoke. One hour. She has one hour to live.

[A]

One hour.

[B]

That's it.

[A]

All I did was hide in a closet. Now you tell me I have to die? I don't believe it.

[B]

You might as well get used to it.

[A]

If this happened back on Earth, a thousand ships would fill the sky. The whole world would know about it. They'd do everything to save him.

[B]

This isn't Earth.

[A]

Such a big dream. Jerry and I separated almost five years ago. We're too young. And I was going to see him to try to make everything all right again. I. Are you married?

[B]

I was.

[A]

Oh.

[B]

She ran off with some guy in the weather service.

[A]

You still think about it?

[B]

I don't let myself.

[A]

Where is she?

[B]

Back on Earth. Look, if you don't mind, I'd just as soon talk about something else.

[A]

Okay. You do, and you've got an hour to live. What do you talk about?

[B]

What's Jerry like?

[A]

Jerry? He's a funny guy. When he found out I. I mean about the other fella, he didn't get mad. He cried. That was all. He felt sadness.

[B]

So you walked all over him.

[A]

I thought I wanted him to get mad at me. To be jealous.

[B]

And now.

[A]

Thinking about him for five years. So when I heard the ship was bound for Woden and I knew Jerry was there, I stowed away. I didn't know about the fuel. I didn't know this would happen to me.

[B]

She had violated a man made law that said keep out. A penalty was not of man's making or desire. It was not a penalty men could revoke. H amount of fuel will power an EDS with a mass of m safely to its destination. The time was 18:30, 40 minutes. It was beginning to get me. A space frontier is a rough place. And I'd seen a hundred men die since I left Earth. But this was different. I watched her as she wrote a message to her folks. I watched her as she fought her way through the black horror of fear toward the calm gray of acceptance. And then there it was on the viewscreen. The planet Woden. A red ball enshrouded in the blue haze of its atmosphere. Swimming in space against the background of star sprinkled blackness. The chronometer on the instrument panel said 1845. Listen, we're in radio range of Woden now. I mean, would you want me to try to contact your husband?

[A]

Jerry?

[B]

It'd mean he would know you're going to die. There'd be nothing anyone can do.

[A]

Yes, I would like to talk to him. Do you think we can?

[B]

The planet is turning. If his group is on the side facing Us. We might be able to reach him.

[A]

We'll try.

[B]

All right. Hello? Hello, Woden? EDS to Government Survey Group. Can you hear me? Come in, Woden. They may not be monitoring. Hello? Hello? Hello? Identify yourself, please. This is Government Survey Group 1 on Planet Woden. This is John Barton, EDS pilot. You have the serum? Yes. How bad is it? One man died last night. Six have the fever. How long will it take? I start deceleration at 1910 hours. I should be able to land at 1930. My God. Look. Do you have a Gerald Cross in charge of the group? Commander Cross. Yes, we do. Could I speak to him? He isn't here. He's out with the survey team. When do you expect him? Can't say. How do you read me? How much time do we have left for communication? Less than 15 minutes. All right. If Commander Cross comes back before we lose radio contact, will you have him buzz me? It's important. Okay, eds. I'll keep the set open. Check. The minutes passed like small bits of eternity. On the view screen, I could see Manning's continent sprawled like a gigantic hourglass in the Eastern Sea. There was a thin line of shadow where it was beginning to disappear as the planet turned on its axis. I looked at the pale woman next to me and I thought of another woman long ago who'd sat next to me and cried because I wouldn't try to understand. What had she written in those letters back home? What would they think of the faceless, unknown pilot who had sent her to her death? What would I think of myself, alone, nights reliving this voyage? I'll turn up the thermostat.

[A]

Nothing from Jerry.

[B]

We have about two minutes of radio contact left.

[A]

Maybe it's. I mean, suppose it were you and your wife tried to call you. How would you feel?

[B]

I don't know.

[A]

Do you ever hear from her?

[B]

I got a letter about a year ago. I tore it up.

[A]

It's foolish.

[B]

Yeah, it was.

[A]

Life is so terribly short to be wandering around alone.

[B]

Well, I. Wait a second. We're getting something.

[A]

How much time before I have to leave the ship?

[B]

About ten minutes. Hello, eds. Hello, eds, come in. Come in, eds, this is Woden. I have Commander Cross. All right, go ahead. Hello. This is Commander Cross. Jerry Cross? Yes. I have someone for you. Go ahead.

[A]

Hello, Jerry. Hello, Jerry.

[B]

Who is it?

[A]

It's me, Marilyn.

[B]

Marilyn.

[A]

I wanted to see you again. I stowed away on the eds.

[B]

You what, Marilyn?

[A]

It doesn't matter, Jerry. All that matters is that I can tell you all the things I've kept Inside for so long. Jerry, I want you to know I. I've never forgotten.

[B]

It's been so many years, I. I can't believe it.

[A]

I thought I'd see you again, but now I can't. Jerry, you. You don't hate me, do you?

[B]

Hate you? Marilyn, I've never stopped loving you. Not for an instant.

[A]

Oh, Jerry.

[B]

Listen, we don't have much time. The transmission is getting fuzzy. Marilyn, I've got to see you. There's got to be some way.

[A]

There isn't.

[B]

Let me talk to the pilot. Hello, pilot. Have you called the mothership? Did you have them checked with the computers? I've done everything. You've been on the frontier long enough to know the setup in an eds. Dear God. There must be something, some way. You think I'd let this happen if I wasn't sure?

[A]

He tried to help me, Jerry. He tried and. It really doesn't matter. I'm not frightened anymore. Not now.

[B]

But how did you get here? I don't understand.

[A]

I was going to me mir to take a job, I thought. Now I realize it was. I was just going because I'd be closer to where you were. Oh, Jerry. All this time.

[B]

Don't. Let me tell you something, Marilyn. I've always known you'd come back to me. I've known it every minute. It's what's kept me alive. I want you to hold that in your mind.

[A]

Jerry, I can't hear you.

[B]

We haven't much time. We're losing radio contact.

[A]

Jerry.

[B]

Good night. On. Just know how I feel.

[A]

I do.

[B]

It's fading.

[A]

There are so many things to say. Jerry, you can still hear me. Maybe I'll come to see you again. Maybe I'll come to you in your. In your dreams. Or probably the touch of a breeze. Or one of those golden winged little birds singing my silly head off. Maybe I'll be nothing you can see or hear, but you'll know I'm there. Think of me like that, Jerry. Goodbye.

[B]

She sat motionless in the hush, the followed. And then she looked at me.

[A]

Now.

[B]

Now. I pulled down the black lever and the inner door of the lock slid open. She walked with her head up and the brown curls brushing her shoulders. I let her do it alone. She stepped into the lock and turned to face me. And I could see the pulse in her throat.

[A]

I'm ready.

[B]

I pulled the red lever and there was a slight waiver as the air gushed out. I thought I sensed a bump, as if something had bumped the outer door. And then there was nothing. The white hand of the closet, Temperature control was back at zero. A cold equation had been balanced, and I was alone in the ship. You have just heard X minus 1, presented by the National Broadcasting Company in cooperation with street and Smith Publishers of Astounding Science Fiction. Tonight, by transcription, X minus 1 has brought you cold equations, written by Tom Godwin and adapted for radio by George Lefferts. Featured on the cast were Court Benson as Barton, Jay Meredith as Marilyn, Milo Bolton as Commander Delhart, Bob Hastings as Jerry Cross, Jack Arthur as traffic control officer and Walter Kinsella as the warden monitor. Your announcer, Bill Rippey. X Minus One was directed by Ken McGregor and is an NBC Radio Network production. And now, next week, in the days of the windjammers, whalers sometimes went on cruises that lasted as long as two years, and so sometimes they had to resort to rough methods to gather a crew. But what of the future, when a cruise to a distant star May last for 15 years or more? We hear of such a voyage next week on X minus 111 1. That's the show for this week, but don't forget, there are thousands more like it at relicradio.com horror, strange tales, science fiction, crime, all available from free. Like to donate to Relic Radio and help keep it all free. You can do that through the website as well. Visit donate relicradio.com to find out more and to see the special downloadable sets that are available. My thanks to those who have donated and thanks for listening today. Talk to you again next week.