This is how our Heroes arrived in Hill Valley and how they fight the Heartless in Ryan's Quest.
Our Heroes arrived in Hill Valley at night
Ryan: Where are we?
Crash: I don't know, this place looks like from the 50's.
Sci-Ryan: It is. Let's look around.
[They look around town and they saw a Boy named Marty McFly who ride the Skateboard]
Evil Ryan: Hey, kid.
He fell of his Skateboard
Ryan: Whoa! Are you alright?
Marty: Yeah, and you might be?
Ryan: I'm Ryan. And these are my friends. Matau, Crash, Bertram, Sonata, Adagio, Aria, Sci-Ryan, Evil Ryan, Evil Anna and Spikewave.
Marty: I'm Marty McFly. But you can call me, Marty.
Ryan: Sure. So what are you doing?
Marty: I came here to get some Invention for Doc. And I need one of those. On my List. It's Paint, Wheels, Tools and a Blueprints.
Ryan: Can we help you?
Marty: Yeah, you should come with me.
They follow him, and they saw the Heartless
Marty: What are those?!
Ryan: Heartless! Marty, hope you know how to fight!
They are fighting them and they defeated them, and they found all the Item for Doc's Invention
Marty: That's all of them. Let's head back to Doc.
They went off to see him at the Twin Pines Mall to met Doc and they found Him
Marty: Doc, I got the Item you want.
Doc: Marty, oh. Who are they?
Ryan: Hi there, I'm-
Doc: Great Scott. You speak normal. Hmm... It looks like you became friends with Marty and you here see my Invention?
Ryan: So what is your Invention you called?
Doc: It's called the Flying Car. I have demonstrated at the Expo in Hill Valley.
Ryan: And what about those Heartless around the Town?
Doc: It's that what you call them? The Heartless came to Hill Valley a moment ago, and I cannot let them ruined the Expo. So build the Flying Car for the Expo. And I have to test it.
He test the Flying Car and it didn't work
Doc: It Failed! Maybe, we were missing something, Oh! I got it! It's need some electricity. But, I don't have enough power to get it started. And Marty, I need you to find the Plutonium. It's at my House, so go get it.
Marty: Alright, I'll be back. Ryan, should I come with you again?
Ryan: Ok. Let's go.
They went to Doc's House and they found the Plutonium, they are heading back and Biff took the Plutonium
Biff: I'll be taking this Box, Butthead.
Marty: Biff! Give that back!
Biff: Nah! Bye!
Marty: Great! Now we have to get it back from him!
They went off and then they saw him Captured by the Large Heartless in Town
Ryan: Oh, great. Now he's been captured by the Heartless.
Marty: Let's go save him.
They are fighting it and they defeated it and Biff give them the Plutonium
Ryan: And hope you learn your lesson, Biff.
Crash: And where will the Keyhole be?
They saw a Keyhole at the Clock Tower, Ryan aim it and now it sealed
Doc: It's look like Expo has been canceled... Looks like have to wait from next year.
Ryan: Yeah. We better get going. Friends out there needs me.
Marty: Hope you can come back to Hill Valley again.
Ryan: See you!
They all left Hill Valley