McCoy recommends a layover so the crew can rest from the constant strain of nonstop duties, and an earthlike but apparently uninhabited planet provides a perfect opportunity for shore leave, but when odd things begin happening on the surface, Kirk becomes suspicious. McCoy, after telling Sulu that the planet is like a setting from 'Alice in Wonderland', spots a large rabbit followed by Alice herself. Kirk runs into his old nemesis, Academy prankster Finnegan, while Sulu discovers a police revolver that he doesn't have in his ancient firearms collection and later runs into a Samurai warrior. Mysterious tracking devices follow the crew's actions and thoughts, and whatever they happen to be thinking of seems to become real - even if it's a deadly threat, as McCoy discovers.
