Paris toast
Doctor Octopus.
his arch enemy has got to be the green goblin, and there are many more like venom, rhino, shocker and hobgoblin.
Arch Duke Ferdinand
ManrayThe Dirty Bubble
doctor otopus
He has had several, but you are probably thinking of Lex Luthor.
of course VENOM(Eddie Brock)
It is a croos between Green Goblin, Venom, Carnage and Morlun.
In the comics, it's the Mandarin, who can also be seen in the tv-series "Iron Man: Armored Adventures" The mandarin is also believed to be the main villain for Iron Man 3 coming out in 2013
Skeletor - if I remember my child-hood TV shows correctly !
He used to be his enemy at the start of the movie but became his friend at the end.
Soccer.