uh shadow mantis i take it you havn't read older comics

lets see

hulk vs wolverine (first appearence ever of wolverine)
spiderman teams up with the fantastic four
spiderman and daredevil
xmen and spiderman
punisher vs spiderman
spiderman vs morbius (even blade made an appareance)
punisher "kills" daredevil
fantastc four and the xmen


as for dc comics
batman and superman
batman and static shock
static shock and the justice leage
superman and static shock


and believe me there are alot more like that