Fan films are typically pretty good. Sure, they don’t have the production quality of feature films, and they rarely have top notch acting. But that’s the beauty of them; love of the character, franchise, or just making films makes up for short comings.
YouTube user Alex Luthor has taken footage from multiple movies and edited them together to make the first Justice League trailer featuring Ben Affleck, Henry Cavill, Gal Gadot, Jason Momoa, and more. He adds The Rock as Black Adam as the bad guy in the film and uses the Chris Pine/Green Lantern rumors.
Check it out:
Alex Luthor has also made at ton of other Super Hero videos worth checking out.