The USS "Enterprise" is rocked by an energy pulse. Science Officer Spock informs Captain Kirk that the gravity pull of the planet fluctuated to zero and the surrounding space momentarily "winked" out of existence. Sensors locate a human presence on the planet that was not there before. Spock and Kirk beam down to the planet and find a one-man spacecraft. A disheveled man named Lazarus appears and slips off a cliff. He is injured, and Kirk has him beamed to the "Enterprise" for examination.