- The Enterprise is thrown back in time to 1960s Earth.
- When the Enterprise is flung back in time while trying to escape the gravitational pull of a black star, they find themselves in orbit around a 1960's Earth. When they are seen by a U.S. Air Force pilot, they beam him aboard but then face the dilemma of what to do with him as he learns more and more about the future. They have to review their initial decision to just keep him when historical records show that his yet-to-be-born son will lead Earth's first successful mission to probe Saturn. Spock devises a plan to do so while also erasing any memory of recent events.—garykmcd
- The Enterprise just arrived in our century (while escaping a black hole they traveled back in time). All systems are down and they are reduced to impulse power only. Uhura cannot contact Starfleet but picks up a general radio frequency that talks about the manned moonshot attempt in 3 days time. The Enterprise has traveled back in time to the 1960's. They have to get back. But the US Air Force saw them, and sent one fast interceptor plane to see what they are. Sulu is trying to get the Enterprise into orbit using impulse power. The plane is ordered to intercept the UFO and forced it to land, or disable it enough, so that it cant escape till the other planes arrive.
One of the pilots is Captain Christopher (Roger Perry). He is a good man with a wife. But his ship is too close to the Enterprise and Kirk starts the tractor beam on him to prevent him from firing, and he is about to explode (as the plane is too fragile to withstand the tractor beam), until Kirk beams him on board. Now Captain Christopher knows everything about the future, and he could destroy the world. But Kirk can't kill him to silence him.
Spock says to Kirk "You can't let him go back." But then the pilot, Captain Christopher, says "I have a wife." Spock looks in the History book, and he tells Kirk that Captain Christopher did absolutely nothing important in his whole life, so they CAN keep him, because taking him would not change History. Kirk is happy about that, because he didn't want to kill him. Spock looks at the rest of the book, and guess what? Captain Christopher's future son (who hasn't been conceived yet) changed the world like you would not believe. His son will be the leader of the first expedition to Saturn.
So now they can't keep him OR kill him, they have to put him back. Also, by the way, his airplane took pictures of the Enterprise (which are now stored in the Air Force library), so first things first, Kirk needs those pictures back. They don't know the way around the Air Force library on the base. Kirk and Sulu get down to the Airforce base and retrieve the recordings, but are apprehended by a guard. The guard takes their communicators and accidentally presses the emergency signal. He is beamed up immediately by Spock. Now they have 2 problems. Meanwhile Kirk and Sulu's activities trigger the security alarms on base and security guards move into position to intercept them. Sulu is able to beam up, but Kirk is arrested by the other security personnel on the base, before he is able to escape. Spock confers with Christopher, who offers to help Spock rescue Kirk.
Spock rescues Kirk with Christopher guiding him, but then Christopher tries to escape, but Spock recaptures him and everyone returns to the Enterprise. The plan is to slingshot around the sun and go back in time, even before they first appeared in the Earth sky. Then break free of the sun and propel forward in time, putting the guard and Christopher in their places at the exact time they were picked by the Enterprise.
Now it is very tricky, but they finally get Christopher transported back inside his plane at the exact moment that he thought he saw the Enterprise. Now the Enterprise has to use a special technique to get themselves back home. It is scary and several yeomen fall down during the turbulence, but they get back home safe and sound.
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