The King Feature Syndicate Action Heroes, aka. King's Watch aka. Defenders of the Earth, vs their Marvel Universe analogues.
Individual or as a team:
Flash Gordon vs Peter Quill (Star Lord)
Mandrake vs Dr. Strange
Lothar vs Luke Cage
Phantom vs Moonknight(or Black Panther)
And vs their DC analogues: Although open to better sugestions:
Flash Gordon vs Adam Strange
Mandrake vs Dr. Fate, Zatarra(or more fun Zatanna)
Lothar vs Bronze Tiger
Phantom vs Batman