He saves George(Dad) from a car hitting him and Marty faces new obstacles as he finds out that Lorraine(Mom) likes him. A few days pass and gets to the dance and still haven't made his mom and dad fall in love which is important because if not, it would change the future. He trying everything since today is going to be the big day but is scared.
The Road Back
Marty meets with Doc at the clock tower and everything seems ready. However, as he gets close to the wire, Marty sees that the wire was disconnected and that if he doesn't make the car work this moment, he is stuck in the past.
Doc comes to the resuce and connects the wired together again. This makes the lighing strike give the car enough power to go back which it did.
Return with the Elixir
Marty is back at present time and Doc doesn't die from the Libyans as Marty warned him.
Marty wakes up and now discovers that everything has changed in family-wise and even him. His house is different and family members are way different then before in a good way.
Marty and his girlfriend are going to the lake and Marty doesn't have to worry about telling his mom about her anymore. Also, the car that he was going to use wasnt not totaled and now has a better car.