The Deadly Years
Summary
Strange radiation exposes the command crew of the Enterprise to the effects of rapid aging. A landing party of Chekov, Kirk, Spock, Bones, Scotty, and Lieutenant Galway divide into small teams to find the planet Gamma Hydra Four's colonists. Chekov enters a building and is shocked to see a dead man and calls others. The landing party meets two other people who are old in appearance but young in age. Bones concludes the analysis and says the two other people have only a few days to live because their bodily functions are aging about 30 years a day. The same thing begins to happen to the landing party upon getting back to the Enterprise. Scotty, Bones, Spock, Kirk and Galway start to get old, but Chekov does not. The aging inhibits the decision-making abilities of Captain Kirk and Spock. A Commodore Stocker who is a passenger aboard the Enterprise takes command of the ship.
Summary from Wikipedia, CC BY-SA 4.0.
Find out more
These links open the services in a new tab with the question pre-filled; the AI assistants may ask you to sign in. Their answers can contain errors.