Galactus
Thanos
Pre-Crisis Darkseid
Spectre
Dr Fate
Swampthing
Doomsday
Shaggyman
Eternity
Warhulk
Miestro
Lobo with clone powers during Lobo: Contact On Gawd
Soloris
Magedohn
Dormammu
Dr Strange
Nightmare
Pheonix
Beyonder
so on and so on buts we should give him credit these guys have to be pretty powerful im not gonna say ANYONE can beat Him it would have to be someone of great power to take down Superman