A giant scientist performs cloning experiments on the Earthlings.
Originally aired: November 30, 1969 on ABC
Writer: Oliver Crawford, Bob Mitchell, Esther Mitchell
Director: Nathan Juran
Show Stars: Don Marshall (Dan Erickson), Deanna Lund (Valerie Ames Scott), Heather Young (I) (Betty Hamilton), Gary Conway (Captain Steve Burton), Stefan Arngrim (Barry Lockridge), Don Matheson (Mark Wilson), Kurt Kasznar (Commander Alexander B. Fitzhugh)
Guest Stars: William Schallert (Dr. Arno) , Sandra Giles (Dr. Greta Gault)
Production Code: 4712
The episode starts in media res with Valerie and Barry in a cage held by Dr. Arno, who is trying to get them to lead him to their camp. They manage to escape, and return to camp where they relate a strange tale of being captured along with Fitzhugh, and put in tubes with mist. Dan, Steve, and Mark go to rescue Fitzhugh while Barry and Valerie stay behind. Chipper starts barking at them, they find they have odd brownish spots on their bodies, and they soon start plotting the destruction of the Spindrift!
Meanwhile, Dan is captured at the science center, and used as a guinea pig in a cloning experiment. The original Valerie and Barry, and Fitzhugh, have been duplicated as well. The originals and the clones all manage to escape, but are recaptured except for Dan, who escapes with Mark and Steve. But which Dan? The men avoid an ambush by the clone-Valerie and Barry, who dissolve. When Chipper reacts poorly to Dan, he realizes that he is the clone, although he has all the memories and personality of the original. Understandably upset, he tries to chain himself up. Steve frees him, Dan goes berserk, then dissolves.
Steve and Mark take Chipper and break back into the science center, using metal parts to block a suction pump used to guard the vents. Using Chipper as a clone-detector, they figure out who is the real group, except for Dan, who has been duplicated again and both versions are taped down and being experimented on. The clones of the others dissolve, and Steve goes back to rescue both Dans. The two Dans fight, one is knocked out, and Steve tries to rescue the conscious one. That Dan turns hostile and fights with Steve, insisting Steve go it on his own. Steve knocks him out and drops him to the others, who realize that one is the original. Steve still tries to rescue the clone-Dan, but he pulls a gun. At the last second he overcomes his madness and sacrifices himself, blowing up the lab while everyone else escapes.
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