Silver Surfer(Takes those pesky speedsters and give'm a good dose of the power cosmic)
Sentry(Supes or WW)
Dr. Strange(Gives Zatanna real magic lessons)
X-man Nate Grey(He'll take care of those telepathic aliens/fish people)
Deadpool(He'll skin Bats alive, drop a grenade in his mouth, then do the Macarena on whatever is left of his corpse)
Quasar(Give John or Kyle a good whoopin)
Beta Ray Bill(Supes or WW, take your pick)
Fine, i'll pick an all DC Team:
Swamp Thing(For those pesky Telepaths/Aliens and for the street level and slightly above JLA'ers. Sh!t, Swampy with his powers of the parliament could take on most of the JLA)
Sentinel Alan Scott(For John or Kyle)
Captain Marvel(For Supes)
Damage(Strong, powerful energy bursts, nearly invulnerable)
Dr. Fate(Magic weakness anyone?)
Etrigan(Magic weakness anyone?)
Anarky(Boy genius who will give Bats a run for his money)
Captain America (Leader) - faces off against Batman
Iron Man (science genius) - faces off against GL
Juggernaut (powerhouse guy) - Faces off against Martian Manhunter
Storm (energy wielder) - faces off against Hawkgirl
Rogue (powerhouse girl) - Faces off against Wonder Woman
Thor (all around powerhitter) - Faces off against Superman
Iceman (clown) - Faces off against Flash
Manhuner is strong enough to get Jugg's helmet off... Go intangible, let Juggs charge through him, Cain looks around confused, Manhunter rips off the helmet from behind and mind rapes him.
WW is both much stronger and much faster than Rogue.
Doubt Iceman is fast enough not to get knocked out by Flash really really fast.