History
Similarly to his Earth-616 counterpart, Mephisto tricked Sigurd the Everglorious to trap him in his realm. However, Loki intervened and rescued Sigurd.
Mephisto also discovered about the death of Kid Loki, but didn't say a word to anybody.[1]
Eons later, Mephisto influenced Doom the Living Planet to fight the Avengers on Earth's orbit.[2]