The original pilot of Star Trek ("The Cage", later reworked into the two-part episode "The Menagerie") included plot points similar to that touched upon in this episode, particularly the aspect of humans being put on display for study.
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His other TZ work was in the second season's "The Odyssey of Flight 33", where he played the co-pilot, and the fourth season's "The Parallel".
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Marcusson is portrayed by Paul Comi, a frequent guest star in TV shows of the 1960s and 1970s, including Star Trek.
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Perrin was in The Twilight Zone episodes titled "People Are Alike All Over" and "Ring-a-Ding Girl."