Thread:Whovianfan/@comment-5038193-20160904233204/@comment-6945486-20160905015731

That's true. His main archnemesis Dormmamu would need to be dealt with and he is a power extra-dimensional entity which is on a cosmic scale. Ruby would need the power gem to help beat him with the help from Dr.Strange.

http://legendsofthemultiuniverse.wikia.com/wiki/Dormammu