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
Did You Know?
Notice the lit Bunsen Burner (at around 10 mins). One could expect that the Gas Main would not still be going after 300 Years. Bunsen Burners weren't used in the labs on the Enterprise, however the Enterprise could have transported equipment down for them. It is also possible that they could have used a different source - such as propane, butane or white gas for the Bunsen Burners. See more
You two will have to recreate their thinking. If you can isolate that virus, you'll be able to develop a vaccine.
[Spock and McCoy trade incredulous looks
Is that all, Captain? We have five days, you know.