Cut back to Marty.
Marty: C'mon, c'mon, here we go, this time. Please, please, c'mon!
Marty bumps the horn with his head. The car starts working! He drives off towards the Courthouse. Cut to Doc. He pulls the cable hard - and it unconnected from the cable attached to the lamppost. Cut to Marty, with a close up of the time display panel. The clock turns to 10.03. Marty hits 75mph. Doc looks up and sees the DeLorean headlights gradually appearing. He attaches the rope to the clockface, taking care not to disturb the hands. Marty wipes some sweat off his face. Doc finishes connecting everything and then slides down the rope.
Doc: Argh!
Cut to Marty in the DeLorean. The DeLorean hits 88mph and lets off blue flashes - it's about ready to travel through time.
Marty: Doc!
Cut to Doc. Doc gets the cable out of the branch. The clock turns to 10.04. Lightning strikes it, and the lightning causes electricity to go down the cables, which Doc reconnects just in time, getting himself a slight electric shock as he does so.
Doc: Ahh!
The lightning enters the flux capacitor. Marty gets sent back to 1985. Doc dances with delight because the experiment was successful.
Doc: Yoo!
And then he turns to the Courthouse.
We see the courthouse. The clock is still at 10.04. A helicopter flies overhead - we're back in 1985. On the park bench is RED, a homeless bum.
Music: Heaven Is One Step Away by Eric Clapton
The above song is playing on Red's radio. Suddenly we hear three sonic booms as Marty re-enters 1985. Red looks up and sees the DeLorean.
Red: Crazy drunk drivers.
Marty opens the doors and gets out.
Marty: Wow, ah Red, you look great. Everything looks great.
Marty looks at the Bank of America clock.
Marty: 1:24, I still got time.
Marty gets back in the car and tries to start it. It doesn't start.
Marty: Oh my God. No, no not again, c'mon, c'mon. Hey.
The Libyans' van drives past.
Marty: Libyans!
It then turns and passes the Texaco station before leaving the Square. Marty chases after them.
He runs into the mall (now called Lone Pine Mall because Marty knocked down one of the pines in 1955!) at 1.33. He's too late. Doc has been shot and falls forward. Marty watches his past self.
Past Marty: No! Bastards!
The Libyans spot Past Marty and aim for him. Past Marty turns away, thinking it's the end. However the Libyan's gun is jammed, giving Past Marty enough time to get into the DeLorean - with the camera - and close the door. He drives off.
Libyan: Go!
Marty watches his past self drive off in the DeLorean. He watches the DeLorean leave 1985 and the Libyans crash into a photo booth. Once it is safe, he rolls down the embankment towards Doc, who's lying there.
Marty: Doc, Doc! Oh, no!
Doc moves.
Marty: You're alive?
Doc undoes his radiation suit - he's got a bullet proof vest on.
Marty: Bullet proof vest, how did you know? I never got a chance to tell you.
Doc gets out the note Marty wrote in 1955. It's been fixed back together.
Marty: About all that talk about screwing up future events, the space time continuum?
Doc: Well, I figured, what the hell.
Doc is driving Marty home. He pulls up at Marty's house and Marty gets out, carrying his skateboard.
Marty: About how far ahead are you going?
Doc: About 30 years, it's a nice round number.
Marty: Look me up when you get there, guess I'll be about 47.
Doc: I will.
Marty: Take care.
Doc: You too.
Marty: All right, good-bye Einie. Oh, watch that re-entry, it's a little bumpy.
Doc: You bet.
Doc reverses and travels down the street. The three sonic booms are heard - Doc's gone into the future. Marty then climbs over his gate and gets back into his house.
Music: Back In Time by Huey Lewis The News
Marty is in bed, in the same pose he was in when Doc phoned earlier that morning. The radio alarm goes off, playing the above song, and Marty yawns.