Doc comes to Marty waving off the idea, and then:
Doc: Of course, from a group of Libyan Nationalists. They wanted me to build them a bomb, so I took their plutonium and in turn gave them a shiny bomb case full of used pinball machine parts!
Marty: Jesus.
Doc: Let's get you into a radiation suit, we must prepare to reload.
A few minutes later, Doc has put more plutonium into the DeLorean and Marty is in a radiation suit.
Doc: Safe now, everything's let lined. Don't you lose those tapes now, we'll need a record. Yep, yep. I almost forgot my luggage. Who knows if they've got cotton underwear in the future. I'm allergic to all synthetics.
He puts a suitcase in the DeLorean.
Marty:: The future, that's where you're going?
Doc: That's right, 25 years into the future. I've always dreamed on seeing the future, looking beyond my years, seeing the progress of mankind. I'll also be able to see who wins the next 25 World Series.
Marty: Uh, Doc.
Doc: Huh?
Marty: Uh, look me up when you get there.
Doc: Indeed I will, roll em.
Marty starts filming.
Doc: I, Dr Emmett Brown, am about to embark on an historic journey.
Doc stops and laughs stupidly to himself - a how could I have forgotten? laugh.
Doc: What am I thinking of, I almost forgot to bring some extra plutonium. How did I ever expect to get back, one pellet, one trip! I must be out of my mind!
Einstein starts barking.
Doc: What is it Einie?
Doc looks to the entrance to the mall. A blue and white van pulls in.
Doc: Oh my God, they found me, I don't know how but they found me. Run for it, Marty!
Marty: Who, who?
Doc: Who do you think, the Libyans!
Marty: Holy shit!
The two hide behind the van.
Doc: I'll draw their fire!
Doc fires his pistol at them. It runs out of bullets.
Marty: Doc, wait!
Doc throws his gun down. They shoot him and he falls down on his back, dead.
Marty: No! Bastards!
The Libyans spot Marty and aim for him. Marty turns away, thinking it's the end. However the Libyan's gun is jammed, giving Marty enough time to get into the DeLorean - with the camera - and close the door. He drives off.
Libyan: Go! Go!
The Libyans start to chase Marty. The two vehicles travel around the mall parking lot, getting faster and faster.
Marty: C'mon, more, dammit.
Without realising it, Marty turns on the time circuits.
Marty: Jeez. Holy shit.
He speeds up even more.
Marty: Let's see if you bastards can do 90!
Marty gets up towards 90mph. Just before we hit 88 the camera pans over to the date on the destination panel - it's still November 5th 1955. Doc hasn't changed it yet. The DeLorean then breaks through the time barrier.
Continuous for Marty audience. Instead of a parking lot, Marty finds himself in a field.
Marty: Argh!
He sees a scarecrow.
Marty: Argh!
He crashes into a barn. In the farmhouse, the lights go on, and a family of four, the PEABODIES, leave their house. There's the Father, Mother, Daughter and son Sherman.
Mrs Peabody: Pa, what is it? What is it, Pa?
Farmer Peabody: Looks like a aeroplane, without wings.
Sherman: That ain't no aeroplane, look!
He shows his family a comic. It's got an alien on it that looks like Marty's radiation suit, and a spaceship that looks a bit like a DeLorean!
Farmer and Mrs Peabody: Ahh!