Well, like I said, the new movies go off on a tangent from the original show, but that's a point. The original Spock (Lenard Nemoy) makes a mistake in the original Trek's future that results in a rogue Romulan (one of the alien races in the show) going nuts and trying to destroy Spock's homeworld of Vulcan (the Vulcans are a peace-loving and intellectual race, where the Romulans are warlike and imperialistic). When the Romulan confronts Spock in a space battle, they both get sucked into a wormhole that leads about 100 years into the past. The Romulan attacks a Starfleet ship under the command of the future Capt. Kirk's father, and it causes such a disruption that the entire history of the universe is forever changed. As a result, all of the friendships that form during the original Trek's history occur in different ways (namely, Spock and Kirk start out as rivals in the new movies, whereas they were friends in the original show). Sorry if it sounds like I'm giving out a lot of spoilers, but I'm really not. That's just the first ten minutes or so, and the new movie is about two hours long.