Quote Originally Posted by Lindy
Probably Juggernaut.

He is THE Unstoppable Force, only by removing his helmet and having a psychic like Professor-X put him to sleep can stop him, and it takes a good portion of the X-Men to even knock his helmet off.

No, Superman is not invincible, yes he can be killed, assuming a Marvel to D.C. then Juggernaut WOULD kill Superman.

Of course, removing the techno-organic virus from Cable, he'd destroy everything since he's the most powerful telekinetic mutant (currently written anyway), the kind that sub-consciously deconstructs houses; but then there's nuffin that I've seen so far to suggest removing the TO-Virus.

I supposes Onslaught would be up there in the tops as well, but that's not exactly a constant thing.

Uhm, the Silver Surfer as well is pretty insanely powerful, destroying an entire planet of Venom-like symbiotes with relative ease. That and I think he can freeze his targets in stasis or something similar.

That's about all I can think of, off the top of my head.

Oh yeah, and Deadpool, like Wolverine, but with a faster healing factor and more controlled. Deadpool can lose an arm and regrow it instantly at will, so he's basically invincible.
For starters, I doubt Deadpool could survive something like being thrown into the sun. He wouldn't last two seconds in a fight to the death with guys like Superman. Cable did actually have the virus removed, but as I understand it he runs the risk of his powers burning him out if he uses them to their full extent. He'd certainly be a tremendous threat if he didn't care about killing himself. Juggernaut isn't actually very powerful in the grand scheme of things though. Onslaught easily beat the crap out of him, and the Hulk was able to punch a hole in Onslaughts armour.

I'd be tempted to say Hulk could go toe to toe with Superman, since he supposedly can keep getting stronger as long as he keeps getting angrier, and has a healing factor that has let him regenerate from having all the flesh burned off of his bones. But with Supermans speed I doubt Hulk could keep up.

Guys like Silver Surfer or Thor should be able to go toe to toe with Superman though. I mean Thor is a norse god afterall.