Round 1: Scott Summers
Round 2: Reed Richards
Round 3: Arthur Curry
Round 4: T'Challa
Round 5: Clark Kent
Bonus round: Stephen Strange
All Superheroes are married.
Not a straight up fight of course. Catherine has 7 days to get the men to cheat on their wife with her and have them die in their nightmares (they will have no physical superpowers in the nightmares by the way). The men are forced to have at least 1 encounter per day (forget this condition in battle 2).
Can take the appearance of a man's exact preference for a woman.
Knows what personality a man yearns for in a woman.
Battle 1: All men seduced individually.
Battle 2: Catherine has two weeks to seduce and kill all the men (Strangle excluded).