Thor: Ragnarok has brought one of Marvel’s biggest grudge matches into the spotlight by pitting the god of thunder against the Hulk in a literal gladiatorial bout. It’s only the second time the two have met as opponents in the Marvel Cinematic Universe, but it’s the latest entry in a long, long list of fights in… well, just about every other medium. The question is: why?
Why are Thor and Hulk at each other’s throats so often? When did it start, and why does it matter? To answer these questions, we have to go back — way back.