Odin vs Mephisto

Double KO via headbutt

Didnt Demogorge eat mephisto in his own realm?

Franklin destroyed him or his realm but he came back.

^^ Franklin's mental blocks were let loose, and Meph was no longer amped.

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Mephisto, prefers other forms of abuse instead of relying on his "galaxy shattering" power:

Hmm Mephisto has better showings against Galactus but worse agaisnt Dormammu...I say tie.

Possibly

Odin wreck him