This is how Sci-Ryan, Ryan and the Dazzlings defeat Ryvine's Heartless in Crash's, Thomas' and Ryan's Adventures of LEGO Dimensions.
[They're in the Blue Dragon World]
Ryan F-Freeman: Girls? Where are we?
Adagio Dazzle: This must be a new world, Ryan.
Sci-Ryan: Is this... a new world?
[They went to Talta Village]
????: This world has been connected.
[And they saw the house's gone]
Ryan F-Freeman: What's this?
????: Tied to the darkness.
[Everything is gone]
????: Soon to be eclpsed completely.
[They saw sky turned purple]
????: There is so very much to learn. You understand so little.
[Everything is shaking]
????: A meaningless effort.
[Everything has been collapsed]
????: One who knows nothing can understand nothing.
[They saw Megatron and they off to see him]
Mal (Ryvine's Heartless): Have a look at this place. To the heart seeking freedom, like this world, the islands is a prison. And so Sora found a way to escape his prison. He found a way to cross to other worlds. Then he open his heart to darkness.
[Then he changed into Mal]
Sci-Ryan: MEGATRON!
Mal (Ryvine's Heartless): Do not bother, Shadowbolt. Your voice can no longer reach Sunset Shimmer's bodygaurd. His spark belongs again to darkness. All worlds begin in darkness, and also ends. The heart is no different. Darkness sprouts within it. It grows, consumes it. Such is it's nature. In the end, every heart returns to the darkness whence it came.
They back away from him
Mal (Ryvine's Heartless): You see. Darkness is the hearts real power when you hate Kamen Guts.
Sci-Ryan: DON'T SAY THAT! We love Kanen Guts like Nate and his Grandfather. The heart maybe weak and sometimes, it may even give in. What I've learned, that deep down, there's a light that never goes out.
Mal (Ryvine's Heartless): You have come this far, still you don't understand nothing... every light must fade, every heart and spark return to Darkness!
They are gonna him and they are in the Darkness
Sci-Ryan: Where are we now?
Mal (Ryvine's Heartless): Behold the endless abyss. Within it lies the heart of all worlds. Kingdom Hearts!
They saw the Door to Darkness
Mal (Ryvine's Heartless): Look as hard as you are able. You will never find even the smallest glimmer of light. From those dark depths are all hearts born. Even yours.
And they saw a Giant Heartless
Mal (Ryvine's Heartless): Darkness conquers all worlds!
Then they fell, Ryan and his friends has been sucked into the Portal and Sci-Ryan is falling to his doom
Megatron: (Voice) Giving up? Come on, Sci-Ryan. I thought you are better then that.
Odette: (voice) Megatron's right. You can be more better, my friend.
Sci-Ryan is gonna fight him, he fighting him and he save his friends and after Mal (Ryvine's Heartless) is still alive
Mal (Ryvine's Heartless): It is not the end. The Keyblade, Digimon and warriors alone... cannot seal the door to darkness. KINGDOM HEARTS! Power me up with the power of darkness!
The Door is gonna open then Mal gain an anthro pony form
Mal (Ryvine's Heartless): Supreme Darkness.
Sci-Ryan: You are wrong, Mal. Sora now taught me. 100 percent. Kingdom Hearts.... IS LIGHT!!
Then Light appeared
Mal (Ryvine's Heartless): Bwah! Uh...gah.... Light? But... But, Why?
Mal (Ryvine's Heartless) is gone, and now they're gonna close it
Sci-Ryan: Come on!
Ryan look at the door and he look scared
Adagio: Stop looking and start pushing, Ryanagio.
They saw the Heartless
All: Heartless!
Sonata: Hurry!
Sci-Ryan: Can't do it...
Megatron: Come on, Sci-Ryan! Let's do it for Sunset!
Sci-Ryan: Okay!
They are going to close the door, but it's not working
Aria: It's no use! It's no use! We are doomed!
Then Darkside are gone, and they saw Robotboy, Kai and Conker
All: Kai! Robotboy! Conker!
Kai: Now, Sci-Ryan. Let's close this door for good!
Ryan: Close it quick!
Sci-Ryan: But...
Conker: Don't worry, we will be a door to the light.
Ryan: You have to trust them like Morro.
Megatron: Sci-Ryan. Take care of Sunset and Optimus for me. Including Princess Twilight Sparkle. I guess Ryan has a friendship with her.
Robotboy: Ryan and the Dazzlings? Thank you.
They close the door
Megatron: We'll find you soon.
They finally close the door and went to the Portal