Superman enemys, top 3 makes the cut

Superman enemys,

Who would make the top 3 that are most powerful, had the hardest time with etc...

Who makes the top 3 cut?

Are we talking well known ones or Obscure ones?

Dominus, H/P Doomsday, mr. mxy, And Gog come to mind.

he also had an enemy that could literally do anything he thought. even amped himself to like 10 times superman's strength. can't think of his name tho.

The well known ones.

Add Mongul to nvr's list.......

Brainiac and Luthor should be up there.