Thanos HAS to win.
If Rulk beat Thanos, why the f**k stop there? Throw in Classic Beyonder, Dr. Strange, Spectre, Superman, Squirrel Girl, Green Lantern Corp, Batman with Destroyer Armor, King Thor, Ric Flair, Galactus, Living Tribunal, Anti-Monitor, Superboy-Prime, and eventually The-One-Above-All Celestial.
Originally posted by StiltmanFTW
No need to worry, Big G owned him after that.
'Cause that was an earlier version of Galactus, right? And GM and the Collector were in the present 616...