Writer:	Esther Mitchell, Bob Mitchell
Director:	Harry Harris
Star:	Don Marshall (Dan Erickson),  Kurt Kasznar (Commander Alexander B. Fitzhugh),  Don Matheson (Mark Wilson),  Stefan Arngrim (Barry Lockridge),  Gary Conway (Captain Steve Burton),  Heather Young (I) (Betty Hamilton),  Deanna Lund (Valerie Ames Scott)
Guest Star:	Parley Baer (Senator Obek),  Douglas Bank (Policeman),  Keith Taylor (Newsboy),  Elizabeth Rogers (Secretary),  John Marley (Zarkin),  Robert Colbert (Bolgar)

Supposedly due to mid-season repair work, no shots are seen of the Spindrift exterior in this episode. (edit)

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Steve, Dan, and Mark don't seem to have a walkie-talkie in this episode, leaving the others to wonder repeatedly what's going on. In many previous and subsequent episodes, usually one of the men has a radio that they can contact the ship with. (edit) Bolgar, like Inspector Kobick, now knows the exact complement of the Spindrift. How? And like Kobick, he seems to be ignoring other Earthlings like the four boys from The Lost Ones. (edit) Within walking distance: yet another, previously unseen "Police Security Headquarters", and a bank (edit) 50-year technology gap: "ion" explosives (edit) Mark's shoulder is injured and he goes on about it for some time. However, after being rescued he does some heavy lifting and great deal of twisting and turning and climbing without noticeable effects. Later, when he lures Zarkin out, he is clutching at his shoulder again. (edit)

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