I reading "BACK TO THE FUTURE". It was published 1998 by"screen play company"

Main character is MARTY and DOC and Marty's mother in this time.

Marty protected past his father and encountered an accident. He was helped by his mother's family. Of course ,this is past world, his mother is very young.
His mother recommend stay tonight, but Marty decline it.
Marty go to Doc's house and he told to Doc, about "I came from the future"
Doc does not believe it. but Marty does'nt give up. He said Doc's bruise reason.
Fainaly,Doc believe it. but can't return Marty to the future that need many power.
Marty remember future newspapaer that bolt of lightning is gonna strike the clock tower aprecisely PM 10:04 next Suturday.
They decided to return the future that using bolt of lightning.

thin 痩せている
you're so thin.

bruise 打ち身、打撲
You've got a big bruise on your head.

Do you mind if ～してもいいですか
Dou you mind if Isit here.

I gotta go 行かなくちゃ　（I have get to go）

come up with 見出す、考え付く
you come up with the idea.