This is how Our Heroes came to the Fantastic Beasts and Where to Find Them World and bring Dipper, Mabel and the Others Home in Weekenders Adventures of LEGO Dimensions.
[The Portal and a Shooting Star has comes out and it landed to the Ground and it revealed that Our Heroes is a Shooting Star after they have been send here from the Star Shard]
Emmet: Whoa, what just happened?
Tino: We have been send to this Dimensions, thanks to that Star Shard that Fuyunyan had.
Laval: Why would that Floating Cat had that Star Shard?
Tino: I don't know. I guess he took from Yen Sid.
Batman: Now where are we?
Gandalf: We could ask someone.
(A Man with a Suitcase bumps into them, and it is revealed to be Newt Scamander)
Newt Scamander: Dreadfully sorry about that.
Tino: It's Ok.... Huh? Who are you?
Newt Scamander: I'm Newt Scamander.
Harry Potter: Are you a wizard?
Newt Scamander: Of course, and who might you be?
Harry: Harry Potter.
Newt Scamander: Pleasure to meet you.
Harry Potter: You too.
Sunset Shimmer: So what are you doing?
Newt Scamander: I was looking for my pets.
Newt Scamander: Just some. I did have some beasts.
Emmet: (in the 9th Doctor's Voice) Fantastic!
Owen Grady: And what's in the Suitcase?
Newt Scamander: Oh, there's alot of Creatures that I put on my travels.
Gandalf: Goodness. I didn't know that.
Newt Scamander: Anyway, can you help me?
Carver: For what?
Newt Scamander: To save New York from all those Portals. Look around!
They saw every bad guys destroyed New York
Newt Scamander: Those Portals has released all the Creature that I don't know about, even though it took Tina's Wand. Look!
They saw them steal item and throw them to the Portal
Newt Scamander: And I have to get it back from them! Even though, I have to Rescue them too.
They saw them taking Dipper, Mabel and their Friends away to the Building
Dipper: Help us!
Mabel: They are taking us to the Building!
Newt Scamander: They were from another Dimension and they need my help from them. We have to save the City or else they're take over New York.
Tino: Okay, let's do it!
They went for to save the City even Dipper and his friends
Tino: We have hurry and save the City!
They are fighting many Bad Guys and they went off to save Dipper and their Friends and it was Hades
Hades: The Special and he got some Allies. How Cute.
Tino: Are you the one who causing New York into Chaos?
Newt Scamander: And where's Tina's Wand?
Hades: Right in my Hand.
He throw it to the Portal
Bad Cop: What are you doing?
Hades: Giving this to Vortech. Bye.
He's gonna a leave
Hades: Oh, and one more thing. Save them because I'm drowning them.
Then the Cage is going down with Dipper and his friends
Stan: We're gonna drown!
Tino: We have to save them!
They are gonna save them, but they don't know which button was to stop
Laval: Maybe this Button.
He press the Button and it release the Sharks and they look hungry for Dipper and his friends
Dipper: Wrong button!
He press the Button and the Water look electrified
Ford: Stop shocking us!
Tino: My bad!
He press another Button and it release all the Piranha and they all look Hungry too
Stan: Not that one!
He press the Button and it release the Snakes
Bad Cop: Snakes. Why does it have to be snakes.
Tino: Which button should I choose?!
Then Doraemon press the Button and Cage has stop
Tino: Whoa, how did you do that?
Doraemon: Well, because that button say off.
Tino: That will work.
They get them off
Dipper: Phew, thanks for saving us.
Batman: No problem. let's take you home.
X-PO has opened a Portal for Dipper and his friends to Gravity Falls and they went back home
Tino: Alright, let's go.
Batman: Except for me, my leg is broken for running.
Tino: Let us help ya, Batman.
They carried him and take him to the Portal and our Heroes went to another Portal