Robocop has actually faced off against the Terminator believe it or not one of Superman's enemies.

Superman VS Terminator

Batman
Blade
Captain America 
Catwoman
Daredevil
Elektra
Fantastic Four
Green Hornet
Green Lantern
Incredible Hulk
Incredibles
Punisher
Robocop
Shazam 
Spiderman
Steel
Supergirl
Swamp Thing
Teen Titans
Teenage Mutant Ninja Turtles
Wolverine
Wonder Woman 
X-men