most powerful superman villian

[jimmy-neutron]

Though people may go for Lex Luthor, I always thought one of Superman's most powerful (and believable) villain was the Parasite. He only seemed to be defeated because of absorbing too much energy.

By "believable villian" I mean someone/thing(!) who was evenly matched Superman, and didn't have such outlandish powers. So, I wouldn't include Mr Mxyzptlk, because (in principle) he should be more powerful than Superman.

(In fairness, I guess I'm really restricting myself to villians from the 60's-70's).

[carmine]

Composite Superman should be up there. but he's not very believable.

[Ruby Spears Superman]

 Darksied is one. As far as strength goes, he is probably on par with Superman. Plus, he is a God after all.

[jimmy-neutron]

Having just read "The Last Secret Identity", King Kosmos, should be included.

Was he too powerful though? It was only with the help of "Superwoman of Metropolis" (otherwise known as Kristin Wells from the 29th century) that he managed to overcome him.

It was alluded that Superman would meet him again. Did he?

[davidelliott]

Bizzaro am imperfect version of Superman... him am not strong as Superman

[jimmy-neutron]

Bizzaro am imperfect version of Superman... him am not strong as Superman

I always regarded Bizzaro as mis-guided rather than evil or as a villain

[NotSuper]

I'd go with the Anti-Monitor. He fought the Spectre to a stand-still. And he was easily the most evil villain to ever plague the DCU.

[nightwing]

Bizzaro am imperfect version of Superman... him am not strong as Superman

Actually, that's a good point.  Logically shouldn't Bizarro be non-super?  Or perhaps even handicapped?