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This week on Journey Through Sci-Fi, we head into the Star Trek universe to explore one of its most enduring mad science taboos: genetic engineering. From Space Seed and the rise of Khan to Enterprise's Augments arc and Deep Space Nine's shocking Bashir reveal, we trace how Star Trek keeps returning to the dangers of trying to "improve" humanity.

Along the way, we get into the Eugenics Wars, creator-creation relationships, scientific hubris, and why a utopian future still casts a long shadow over forbidden science.

Plus: Brent Spiner being superbly awful, Bashir's identity crisis, and why this theme runs through Star Trek for more than 200 years of in-universe history.

Episodes discussed:Star Trek: The Original Series — "Space Seed" (S1E22)Star Trek: Enterprise — "Borderland" (S4E04), "Cold Station 12" (S4E05), "The Augments" (S4E06)Star Trek: Deep Space Nine — "Doctor Bashir, I Presume?" (S5E16)

Also referenced:Star Trek — "What Are Little Girls Made Of?"Star Trek: The Next Generation — "The Schizoid Man"Star Trek: Voyager — "Tuvix"