When their worlds collide, when they have to work together, when they learn each other's past, will they get along? Or will they be the reason the whole world will be taken over by darkness and fear? Jack, Rapunzel, Merida and Hiccup must join forces to destroy Pitch Black. Can they do it? ~~RotBTD fan-fic. Pairings are Jackunzel and Merricup~~ *Milzy*