Mikaela: Why are you here?
Optimus Prime: We are here looking for the All Spark. And we must find it before Megatron.
Sam Witwicky: Mega-what?
Optimus Prime: Our planet was once a powerful empire, peaceful and just, until we were betrayed by Megatron, leader of the Decepticons. All who defied them were destroyed. Our war finally consumed the planet, and the All Spark was lost to the stars. Megatron followed it to Earth, where Captain Witwicky found him...
Sam Witwicky: My grandfather.
Optimus Prime: It was an accident that intertwined our fates.
Moustache Man: Come back! I think the dogs have found something.
Captain Witwicky: The ice is cracking!
Captain Witwicky's Men: Captain!
Moustache Man: Grab my rope, Captain!
Captain Witwicky: I'm all right, lads!
Moustache Man: Can we throw you a rope, Captain?
Optimus Prime: Megatron crash-landed before he could retrieve the Cube.
Captain Witwicky: Men! We've made a discovery!
Optimus Prime: He accidentally activated his navigation system.
Optimus Prime: He accidentally activated his navigation system. The coordinates to the Cube's location on Earth were imprinted on his glasses.
Sam Witwicky: How did you know about his glasses?
Optimus Prime: eBay.
Sam Witwicky: eBay...
Ratchet: If the Decepticons find the All Spark, they will use its power to transform Earth's machines and build a new army.
Optimus Prime: And the human race will be extinguished. Sam Witwicky, you hold the key to Earth's survival.
Mikaela: Please tell me that you have those glasses?
Optimus Prime projects a holographic view of Cybertron, the switches it to Captain Witwicky discovery of Megatron in the ice. The Captain fiddles with Megatron's gears, causing a bright light to imprint his glasses.