Stardate 3113.2: After pulling away from a black star, the Enterprise travels back to the late 1960s. US Air Force pilot Captain Christopher spots the ship in Earth's atmosphere. When the Enterprise's tractor beam tears his aircraft apart, there is no way but to beam out Christopher. Spock discovers that Christopher will have a son, who would lead the first Earth-Saturn mission, and hence must return to Earth in order to preserve history. Also, while a way to return to the 23rd century has not yet been found, Kirk and Sulu beam down to the Air Defense Command to steal the tapes and films with evidence of the "UFO" that is the Enterprise. But they are discovered and a security sergeant is accidentally beamed up to the Enterprise in their place, while Kirk stays behind and is being interrogated by Colonel Fellini. Spock beams down with Sulu and Christopher to free the captain, but Christopher grabs a revolver because he wants to stay on Earth. Spock disables him with a nerve pinch. In the meantime Spock has found a way for the ship to return and fix the time travel incident. The Enterprise accelerates toward the Sun, thereby initially traveling back in time until the ship breaks away from the Sun. With time now running fast forward, Christopher and the sergeant are beamed back to Earth at just the right instances before they can spot the intruders, while the ship continues its travel to the 23rd century.

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