Marty and Doc get out of the DeLorean. Doc's wearing a rubber mask! He starts peeling it off.

Doc: Excuse the disguise, Marty, but I was afraid you wouldn't recognise me. I went to a rejuvenation clinic and got an all-natural overhaul. They took out some wrinkles, did a hair repair, changed the blood - added a good thirty or forty years to my life. They also replaced my spleen and colon. What do you think?

Doc "models" his new face.

Marty: You look great, Doc.

Marty looks around.

Marty: (mutters to himself) The future.....unbelievable..... (to Doc) I gotta check this out Doc.

Doc: All in good time Marty, we're on a tight schedule here.

Marty: Tell me about my future. I mean, I know I make it big, but what do I become like a rich rock star or something?

Doc: Please Marty, no-one should know too much about their own destiny.

Marty: Right, right.....I am rich though?

Doc gets a bag out of the DeLorean.

Doc: Marty, please, take off your shirt.

Marty does so.

Doc: Put on the jacket and shoes.

Doc goes into the car and gets out a pair of futuristic binoculars. It looks a bit like a very thin camera.

Doc: We've got a mission to accomplish!

He runs to the end of the alleyway and uses this gadget. Cut to a street. Doc looks at a woman walking down it, then MARTY MCFLY JUNIOR walks past her. Doc uses the gadget to watch Marty Junior, who looks almost like his father aged 17 (ie 1985 Marty) walk into a futuristic 'phone box.

Doc: (muttering) Precisely on schedule.

Cut to Marty. He's go the shoes out of the bag and put the right one on his foot. It automatically laces up!

Marty: Power laces, all right!

He puts on the left shoe and it does the same thing. Marty then gets the jacket out of the bag and puts it on. It's a bit big! Cut to Doc running back towards Marty. Marty's jacket has a little button on it that flashes.