Trivia / Star Trek S3 E17 "That Which Survives"

• Prop Recycling:
  • The bypass valve room that Watkins enters consists of re-used pieces of the Yonada control room from "For the World Is Hollow and I Have Touched the Sky". The control panel was re-used from the Vians torture chamber in "The Empath".
  • Spock's calculation device was reused from the remote control prop last seen in "Spock's Brain", which was in turn a reuse of one of the communicators from the first pilot, "The Cage".
• What Could Have Been: In the story outline, "Survival" the image of Losira was more brutal and caused crewmembers to fight among themselves in a manner that seems reminiscent of the Defiant's crew in "The Tholian Web".
• Working Title: The Radiant One, Survival.