Combine two franchises into one movie

[Magicman38]

I was thinking what if two totally different but huge franchises were combined into one.

I’ll give an example:

Game of Thrones-The army of humans is about to lose to the the Night King and the Army of the Dead. When all of the sudden Iron Man, Thor , Captain America and Black Widow arrive to help John Snow, Sansa Stark and the rest of the Army of the North.

Let’s here some of yours. No combinations is too crazy!