Kronan Battle

This blink-and-you'll-miss-it scene takes place when Yondu, Rocket, and Groot jump across the cosmos, heading toward Ego. Along with certain other scenes, including Stan Lee’s cameo, the seemingly LSD-filled trip takes the heroes over a planet where two creatures are battling.

Given their rocky appearances and their gear, we can safely say that the fighters are Kronans. We already saw the God of Thunder quickly dispatch one  in Thor: The Dark World. Next up, director Taika Waititi will voice Korg, a Kronan who ends up being Thor’s ally, in Thor: Ragnarok.