Skinhead: I dunno, but when he gets down we're gonna nail him.
Match: How the hell'd he change his clothes so fast?
1955 Marty: (o.s) ...an oldie where I come from. (to Starlighters) All right guys, it's a blues riff in B, watch me for the changes, and uh, try and keep up, OK?
Music: Johnny B Goode by Marty McFly with the Starlighters
Biff's gang goes up to the side of the stage as 1955 Marty starts to play. They're there waiting for him to finish the song before they nail him. Only 1985 Marty sees them. He gets out his walkie-talkie.
Marty: (w.t) Doc!
Cut to Doc.
Marty: (v.o) Doc, come in!
Doc: (w.t) Marty, come in!
Cut to Marty. The song is still going.
Marty: (w.t) Listen Doc, Biff's guys chased me into the gym and they're gonna jump.....me!
Cut to Doc.
Doc: (w.t) Then get out of there!
Marty: (v.o) No Doc, not me, the other me, the one's that's up on stage playing Johnny B Goode!
Doc: (w.t) Great Scott! Your other self will miss the lightning bolt at the clocktower, you won't get back to the future and we'll have a major paradox!
Cut to Marty.
Marty: (w.t) Wait, wait, a paradox? You mean one of those things that could destroy the universe?
Doc: (v.o) Precisely!
Cut to Doc.
Doc: (w.t) Marty, you have to stop those guys at all costs but without being seen by your other self - or your parents!
Marty: (w.t) 10-4!
Meanwhile Biff is waking up again.
Biff: Where is he?
Wallet Guy: Who?
Biff: Calvin Klein.
Wallet Guy: Who?
Biff: The guy with the hat. Where is he?
Wallet Guy: Oh.
He points towards the gym.
Wallet Guy: He went that away.
Biff runs to the gym. The wallet guy calls after him.
Wallet Guy: I think he took your wallet!
He turns to the crowd.
Wallet Guy: I think he took his wallet.
Back in the gym, 1955 Marty is still playing.
1955 Marty: (singing) Go Johnny go, go, go; Johnny B Goode.
1985 Marty hums along for a few moments then sees Biff's gang again. They are on the side platform, with weapons, waiting for 1955 Marty to finish so they can beat him up.
1955 Marty: (singing) Go, go, go Johnny go, go; go Johnny go, go, go; go Johnny go, go; Go Johnny go, go, go; Johnny B Goode
1985 Marty spots sandbags above Biff's gang. He climbs the rigging above the stage and slowly crawls across it. We see a view of 1955 Marty playing his guitar solo with 1985 Marty, almost hidden, climbing along the top. He is unseen. Marvin makes his phonecall to his cousin Chuck. 1985 Marty tries to untie the rope holding up the sandbags.
Marty: Come on....
He manages it, and the sandbags fall on Biff's gang.
Match/Skinhead/3-D: Oomph!
They fall unconscious. 1955 Marty goes a bit overboard, and by the time he's finished playing some rock music, the dance is silent, looking at him. 1985 Marty climbs down. 1955 Marty looks at the crowd.
Strickland is covering his ears.
Marty: I guess you guys aren't ready for that yet. But your kids are gonna love it.
1985 Marty leaves the stage and gets out the walkie-talkie.
Marty: (w.t) Hey Doc, success, everything's cool.
Doc: (v.o) Great, I'll be landing on the school roof in about 1 minute.
Marty: (w.t) I'll be there.