- When a temporarily insane Dr. McCoy accidentally changes history and destroys his time, Kirk and Spock follow him to prevent the disaster, but the price to do so is high.
- When an accident causes Dr. McCoy to go temporarily insane, he escapes to a strange planet. There, the search party discovers a device left by a superior, vanished civilization, a time portal that plays the history of Earth for them - but then Bones jumps through it into the past, causing a change in history important enough to make the Enterprise vanish. Kirk and Spock, who fortunately made a tricorder recording, must attempt to go through to just before McCoy's arrival and stop him from changing history in the United States during the Great Depression, where they have no advanced technology available.—KGF Vissers
- After being accidentally injected with a powerful drug, Dr McCoy flees the Enterprise in a hysterical state and beams down to the desolate planet the ship has been orbiting. Searching for McCoy, Captain Kirk and his landing party discover a mysterious time vortex through which the good doctor has escaped.—FilmsNow
- When a drug-crazed Dr. McCoy leaps through a time portal to 1930 Earth, he does something to change history resulting in the disappearance of the Enterprise. Kirk and Spock soon follow hoping to arrive just before McCoy. They soon find themselves working at the 21st Street Mission for the beautiful Edith Keeler. Spock builds a crude computer and finds two newspaper articles about Edith: one dated 1936 about a meeting she had with President Roosevelt and the other her obituary dated 1930. The question then becomes which of the two are correct. Is Edith Keeler, with whom Kirk has fallen in love, supposed to live or to die?—garykmcd
- The Enterprise passes a planet which sends out shock waves (caused by changes in the space time continuum.. something on the planet has the ability to change time). Sulu is badly hurt at his helm station, McCoy prepares to administer an important drug called Cordrazine. "A few drops can save your life." says McCoy. Just then, another shock wave hits, and McCoy accidentally injects the drug into his own arm (the entire hypo-spray). McCoy has become a madman, and is running around like crazy. He punches a guard, and beams himself down to the planet.
Of course, they must try to rescue him. Kirk, Spock, Scott, Uhura and two red-shirts (security) beam down after him. When they arrive on the rocky planet, they see a large arched gateway with shimmering rocks. There are rocks all around, and McCoy is hiding behind one. Spock gives him a neck pinch to put him temporarily to sleep. The arch speaks in a dark, forbidding voice. "A QUESTION!! SINCE BEFORE YOUR SUN BURNED HOT I HAVE AWAITED A QUESTION." The arch then 'says' that it is the Guardian of Forever. It displays scenes from world history within the semi-circle of its arch, ranging from Egypt, to Palestine, to Rome, to modern day, and keeps showing them in a loop. "The Guardian" says they can travel to anywhere in the past they wish. Spock (finally) turns on his tri-corder. Uhura is in contact with the ship (to prepare for when they need to beam up).
McCoy wakes up, pushes the two guards aside, jumps into the arch, and vanishes. Uhura says "Captain, I've lost contact with the ship." They all check their communicators, and have nothing but dead air. The Guardian says slowly, "All that you knew is gone." Kirk is confused. Spock theorizes that McCoy must have changed history, when he arrived in the past. Now they must rescue him. Only Kirk and Spock will go to find the solution and rescue McCoy and the Universe. Kirk says "If we fail to correct the damage McCoy did, all of you must jump in. You will be alive at least in the past. Uhura says "Captain, I'm scared". Kirk comforts her. Spock times the 'jump' with his tri-corder and they both jump in.
They are back in 1930's Earth in New York, during the Great Depression of the 1930's. Everyone is poor. They steal some earth clothes to 'hide out' and duck into a basement running from a cop. Someone asks from the top of the stairs "Who is there?" They say "We just wanted to get warm." The woman coming down the stairs is beautiful, like an angel. She is a social worker with big ideas, very, very pretty, and Kirk is attracted to her. She gives Kirk and Spock a job at 15 cents an hour, and Spock tries to build a computer using copper wire and other cheap material. He says to Kirk "You are asking me to assemble a mini computer using the equivalent of stone knives and bearskins." Spock explains that they cannot determine whether McCoy arrived before or after their 'jump.' But during the time before McCoy comes, Kirk is falling in love with Edith Keeler (Joan Collins). Spock finally assembles enough data to examine newspaper articles from the time to show the two different time-lines that would occur, and that Mccoy somehow changed. It turns out that the focal point is Edith Keeler. In the first time-line, Edith becomes the head of a peace movement that grows to such size that it stalls the US entry into WWII, but when she did, she unwittingly let Nazi Germany take over the world. But in the other, she is struck by a truck that very week. Spock concludes that for the Universe to be set right, Edith Keeler must die.
Kirk says to Spock "Spock I believe I am falling in love with Edith Keeler. Spock says "Jim, in order for the Universe to be saved, we need to stop McCoy from somehow saving her. Edith Keeler must die as it actually happened." McCoy lands on the street in the middle of the night, and is still woozy from the Cordrazine. He loses his phaser pistol and a bum picks it up and accidentally phasers himself to disintegration. The next night Kirk is taking Edith to the movies. Edith says "I have been dying to see the latest Clark Gable movie. "Who?" asks Kirk. Edith says "You know Doctor McCoy said the same thing today" (McCoy had walked into Edith's mission on 21st street for a cup of coffee). Kirk says "Who?? Where?" "He's in the mission, she says. "Wait here" says Kirk. He runs across the street to the Mission. McCoy runs out and Spock too. They're reunited.
Then Edith starts to cross the street. Kirk looks and sees a big truck coming. He begins to go after her. Spock says "No, Jim." Then McCoy jumps toward Edith, and Kirk grabs him, and holds him back. The truck kills Edith. She is dead. McCoy looks with horror at Kirk. "Do you realize what you just did, Jim?" Spock says calmly, "He knows, Doctor, he knows." They are returned by the Guardian to the planet.
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