Clark Bartram as Batman in the short fan film Batman: Dead End (2003).

Superman (Mike O'Hearn) and Batman (Clark Bartram) from Sandy Collora's 2004 fan film World's Finest. Based heavily on the comic book continuity of the time, the trailer had the two heroes teaming up against President Lex Luthor and Two-Face. It also borrowed a plot line from their animated team-up by having both heroes' civilian identities vying for Lois Lane's affection.

Unlike Collora's short film Batman: Dead End (2003), wherein the Dark Knight battled a Predator, only to end up surrounded by Predators AND Aliens, World's Finest was presented as a film trailer.

Collora was using both films as auditions to try to generate interest at Warner Brothers to let him make feature films featuring the DC heroes. Sadly, Warners passed, and instead we got the DCEU a few years later.

Thanks for nothing, Warners. As low-budget as it is, I'll take World's Finest over Batman v. Superman: Dawn of Justice any day.