| Episode complete credited cast: | |||
| William Shatner | ... | Capt. Kirk | |
| Leonard Nimoy | ... | Mr. Spock | |
| Kim Darby | ... | Miri | |
| Michael J. Pollard | ... | Jahn | |
| DeForest Kelley | ... | Dr. McCoy | |
| Grace Lee Whitney | ... | Yeoman Rand | |
| Keith Taylor | ... | Jahn's Friend | |
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Ed McCready | ... | Boy Creature |
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Kellie Flanagan | ... | Blonde Girl |
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Stephen McEveety | ... | Redheaded Boy (as Steven McEveety) |
| David L. Ross | ... | Security Guard #1 (as David Ross) | |
| Jim Goodwin | ... | Farrell | |
| John Megna | ... | Little Boy | |
The Enterprise receives an old style SOS signal and finds on arrival a planet that is virtually identical to Earth. Kirk, Spock, McCoy and Yeoman Rand beam down to the planet only to find that it is inhabited solely by children. Kirk befriends one of the older children, Miri, but they soon learn that experiments to prolong life killed all of the adults and that the children will also die when they reach puberty. They also learn that the children are in fact, very old. Soon, the landing party contracts the virus and has seven days to find a cure. Written by garykmcd
The basic storyline was fine, with the children & virus, but there was no point to their planet being a duplicate Earth.
The environment could just as well -- and more plausibly -- have been an Earth-like planet colonized by earthlings in the very early days of space travel, and forgotten by history. Some feature of the planet could easily have accounted for the longevity of its inhabitants.
There was no follow-up or explanation of the duplicate Earth aspect of the story, and the story would have been just as good without it.