The Duchess Assignment - S1-E21
Trivia: The Domo is a recycled version of the Excavator, which was used in the episode "Martian Invasion".
Trivia: The Zombites' jet fighters are adapted and re-sprayed WASP aircraft from "Stingray".
Trivia: Gerry Anderson modeled members of the Tracy family on Hollywood actors: Jeff was modeled after Lorne Greene, Alan after Robert Reed, Scott after Sean Connery and John after Charlton Heston.
Trivia: This episode features extensive flashback footage from "End of the Road", "Sun Probe", "Trapped in the Sky" and "Day of Disaster", and only 17 minutes of new material. The reason for this is because the previous two episodes, "Attack of the Alligators" and "The Cham-Cham" had gone over budget and a flashback episode was required to finish the show's first season.
Trivia: At Tracy Island there are portraits on the wall of Jeff Tracy's five sons: John, Scott, Virgil, Alan and Gordon. Gordon's portrait never bleeped once during all thirty-two episodes of the show.
Pit of Peril - S1-E2
Trivia: This is the first episode to have an on-screen title.
