Board Thread:Questions and Answers/@comment-27389023-20160901160206/@comment-24932697-20180215011737

Thanos is only one of the most powerful characters in the Marvel Universe, if the x-men were part of the MCU, I have a hunch that the Phoenix would be his downfall, just like Apocalypse was defeated by Phoenix. You all gotta remember, Phoenix is capable of destroying whole star systems and solar systems in a matter of seconds, the power of the Phoenix even surpasses that of Galactus's power, having once defeated him with Hope Summers as the host. As the Dark Phoenix, she destroyed an entire solar system in a matter of seconds, and feeding on and destroying the sun of that solar system far faster than Galactus could.