We're Here And They're On Our Enterprise! (Star Trek)

MCCOY: What is this? Everything's all messed up and changed around, out of place. UHURA: Captain, what's happened? MCCOY: No, not everything. That spot, I spilt acid there a year ago. Jim, What in blazes is this? KIRK: I don't know. It's our Enterprise but it isn't. Maybe UHURA: Maybe what, Captain? KIRK: Any of you feel dizzy when we were in the transporter beam? UHURA: Yes. SCOTT: Aye. KIRK: When we first materialised. SCOTT: I did. KIRK: It happened twice. First we were in our own transporter chamber, then we faded, and then when we finally materialised, we were here. Wherever this is. SCOTT: Captain, the transporter chief mentioned a surge of power. The transporter lock might have been affected by the ion storm and we just materialised somewhere else. KIRK: Yes, here. Not our universe, not our ship. Something parallel. A parallel universe co-existing with ours on another dimensional plane. Everything's duplicated, almost. Another Enterprise. Spock with a beard. UHURA: Another Captain Kirk, another Doctor McCoy, another MCCOY: An exchange. If we're here KIRK: Then our counterparts must have been transporting up at the exact same time. Similar storms on both universes disrupted the circuits. We're here, and they're on our Enterprise.