DEATH BATTLE's Wall
Dhalsim (Street Fighter) VS Ermac (Mortal Kombat)
Krieg (Borderlands 2) vs. Marcus Kane aka Sweet Tooth (Twisted Metal)
Gurren Lagann vs. Eva Unit 1
Optimus Prime vs. Burning Gundam
Monkey D.Luffy vs. Mr Fantastic
Cybermen vs Borg..........or Daleks done right
Godzilla vs. Ultraman
Galactus vs. Unicron honestly one of the most epic battles I ever heard of. Although the entire animation for this is going to be a nightmare.
The Powerpuff Girls vs the Power Pack
Any death battle involving this new DC Comics character Simon Dark
The Martian Manhunter (DC Comics) vs The Hulk (Marvel)
Albedo (Ben 10) vs. M.O.D.O.C.K (Marvel Comics)
the mandarien (Marvel Comics) vs. captian planet
Banjo-kazooie vs. Donkey Kong
The Thing (Fantastic Four) vs. The Rockbiter (Neverending Story)?