Avengers: Kaiju War

Avengers: Kaiju Wars is a Japanese/American animated superhero Kaiju crossover film and a collaboration co-produced by Marvel Animation, Man of Action, and Toho Company Ltd. It is centered around the Avengers dealing with the threat of not just supervillains, but Kaiju.

Heroes

 * Avengers
 * Iron Man
 * Captain America
 * Hulk
 * Thor
 * Black Widow
 * Hawkeye
 * Falcon
 * S.H.I.E.L.D
 * Guardians and the Galaxy
 * Fantastic Four
 * Spider Man

Animation
The animation is the same as Avengers Assemble.