Although star Mark Ruffalo concedes that the Incredible Hulk's friendship with Marvel's thunder god in Thor: Ragnarok has an endearing "oddball quality," its quirkiness is nothing compared to the pairing that will be introduced next year in Avengers: Infinity War.

RELATED: Who's Who (and Who's Not) in Thor: Ragnarok

"All of the universes coming together is just a sight gag within itself,” the actor admitted to USA Today, adding that there's plenty of fun to be found in the Green Goliath's unlikely friendship with the cantankerous Rocket Raccoon, voiced by Bradley Cooper.

“It’s a very funny relationship that the two of them have: First of all, it’s the biggest superhero and the smallest," Ruffalo said. "Just keeping them in a frame together is a feat and hilarious in itself.”

That size disparity is of, course, only the beginning, as Rocket's cynicism -- which, as we saw in Guardians of the Galaxy Vol. 2, is used to mask genuine emotion -- would stand in stark contrast to the Hulk's child-like nature. Ruffalo singled out that aspect of his character as part of what makes him work so well with Chris Hemsworth's Thor.

RELATED: Thor: Ragnarok's Tessa Thompson on the Importance of Reinventing Valkyrie

"Hulk’s largeness and simplicity of thinking and Thor’s otherworldly, god-like naivete," he said. "And Banner and Thor together: The least superhero of them all with the most superhero of them all. It’s so silly and goofy and fantastic, of course you’re going to have high jinks.”

Opening Friday nationwide, director Taika Waititi's Thor: Ragnarok stars Chris Hemsworth as Thor, Tom Hiddleston as Loki, Cate Blanchett as Hela, Idris Elba as Heimdall, Jeff Goldblum as Grandmaster, Tessa Thompson as Valkyrie, Karl Urban as Skurge, Mark Ruffalo as Bruce Banner/Hulk and Anthony Hopkins as Odin. Avengers: Infinity War arrives May 4, 2018.