Sora and Ryan made it to Gravity Fall and they saw Dipper surrounded by Dream Eater
Mabel: Dipper, what are they!?
He check in the Journal
Then Sora and Ryan saved them
Dipper: Phew, thanks! I never seen those Creature that Bill Cipher did.
Sora: Yeah, so what's happening?
Mabel: Bill, is trying to take over Gravity Fall and we have to stop him before it's too late.
Ryan: Looks like you need our help.
Dipper: Well, okay. You can help us.
They went off and they found Bill Cipher
Bill Cipher: Well, well, well. Dipper and his friend's are here to stop me.
Ryan: You won't take over Gravity Fall!
Bill Cipher: Oh yeah? Try me!
They are fighting him and they defeated him
Dipper: Phew, thank you for saving Gravity Fall.
Ryan: No Problem, bye.
They left and seal the Keyhole