the year 2330 or stardate 53614563 mark 5 . . . tuesday)
Spock returns horrified through the guardian forever after chasing McCoy who decided that he needed a drink of actual whisky had slipped into an alternative time line of the United States in the late 80's. He witnessed a time line where Lee Harvey Oswald missed his shot at Kennedy and had shot the Kennedy dog Charlie instead.
In a drunken rage Kennedy had decided to take things out on Marilyn Monroe, but suffering from Rage induced whisky d%%% left him feeling even more enraged and impotent. At that moment Kennedy pushed the old red button while muttering take that you vodka snorting atheist commie #######s (you need to say that in a boston accent and throw in a couple of Harvards).
Of course the Soviets reacted when Khruscheve equally drunk fires back at the States while muttering "Nobody likes a Yalie" oblivious to the fact that Kennedy went to Harvard.
Anyways, the world pretty much ends, the few survivors morph into brain eating 6 armed mutants who deal with first contact with the Vulcan's by slow roasting them over a fire while wrapped in basil leaves and soaked in Honey.
All due to one moment of impotence by Kennedy the world ended.
So Spock decided that the needs of me outweigh the needs of the many, aborst his rescue of Bones, who becomes a delicious stew due to his years of whiskey abuse.
Spock then returns to his timeline, steals the enterprise and initiates his calculations for Time warp.
He returns to 1963 in time to witness Lee Harvey Oswald fumbling with his rifle from the grassy knoll and shoots Kennedy with a submachine gun.
On the way back to the Enterprise, Spock kills three nuns, an off duty cop and four construction workers just because killing human's is entirely logical.
Or it could be that cats hated the fact that Kennedy was a dog person
