Ultimate Heroes Togheter

so... i was some random day checking youtube and i saw i have new comments so i decided to take a look to them and this appeared *u*
"What would be awsome? It would be to make a mash up Generator Rex, Ben 10 Ultimate Alien, and Legend of Korra: Ultimate Heroes Together"-awsomerebel55
so here it is ...

Part 1: "The Girl of the Southern Water Tribe :[link]
Part 2: #the guy with the red jacket
[link]

PLOT:
Rex,Ben and Korra , different heroes of different dimensions
are kidnapped by an unknown enemy .This Anonymous enemy has some "proofs" for each one. At first this strange trio thinks it's funny but then the realize that this enemy is playing tricks with their abilities. Rex thinks it's Black Knight , Korra thinks it's Amon and Ben thinks it's Diagon . Who's right? Are they all wrong ? They would learn to face the differences between them, to fight against this mysterious enemy and return to each worlds. Love and Friendship will grow on the road to freedom....

Universe:
Unknown. why ? because i don't know if i would like to develop the story on a MoF or LoK universe.

Main Characters:
-Korra : Korra, a teenage girl from the Southern Water Tribe and the current incarnation of the Avatar, who, is hotheaded, independent, and ready to take on the world. She has already mastered Water, Earth, and Fire, but has yet to master Air.

-Rex S.:Rex is an amnesiac teenager who is not only infected with nanites like everyone else, but is an E.V.O. Unlike most E.V.O.s, however, he is not deformed in any way; unlike all other E.V.O.s, he is able to control his nanites, allowing him to manifest a variety of powers and even cure others of their mutations.

-Ben T.: Ben Tennyson is some random kid who someday founded the one thing that will change his life: The Omnitrix.Now 17 years old , Ben is the most famous hero of his universe. With the help of the Ultimatrix he's available to transform in almost every alien form known

-The Enemy: kidnaps each hero of the universe he prefers. he put mortal or dangerous proofs on them just to have some fun . but ... He will succed this time ?