In the Infinity Gauntlet comic book arc, Thanos becomes the most powerful being in the universe. As a result, the cosmic entities who were previously considered to be amongst the most powerful beings in the universe come together to stand up to the Mad Titan. Galactus, Eternity, the Stranger, the Titan Kronos, Epoch, the entities Love and Hate, two Celestials, Master Order and Lord Chaos all join forces, but are defeated and/or imprisoned by the Infinity Gauntlet-wielding madman. Given that the "meagre" individuals in the Avengers and Guardians of the Galaxy ranks don't come close to matching the power Thanos will be wielding, maybe it would be good for a higher being to make an appearance in the Marvel Cinematic Universe to confront him. Galactus and the Celestials could be tied up with Fox, but the rest of the cosmic conglomerate should be fair game for potential inclusion. It would simply be awesome to see a truly godlike being appear, just to show the likes of Thor, Tony Stark, Captain America and the Hulk how minuscule they actually are in comparison - and to show just how powerful Thanos is when he ultimately defeats it with ease.
