Yes, we all know

Thanks to a fan, you can watch "The Justice League" and "The Avengers" meet in a mashup trailer.

Titled “Avengers vs. Justice League: The Worlds Collide,” the mash-up pits the Marvel and DC Comics superheroes against each other.

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The video also features Wonder Woman vs. Hulk, Hulk vs. Superman, Superman vs. War Machine, among others.

Written and directed by Joss Whedon and produced by Kevin Feige, the last Avengers movie stars Robert Downey Jr., Chris Evans, Chris Hemsworth, Mark Ruffalo, Don Cheadle, Cobie Smulders, Stellan Skarsgård, Samuel L. Jackson, Scarlett Johansson and Jeremy Renner reprising their characters from the prequel movie.

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In the upcoming "Justice League," Superman (Henry Cavill), Batman (Ben Affleck), Wonder Woman (Gal Gadot), theFlash (Ezra Miller), Aquaman (Jason Momoa) and Cyborg (Ray Fisher) will unite to battle evil