Read more about Ultimo (Marvel) at: Wikipedia

Official Site: Marvel comics

:For the Stan Lee and Hiroyuki Takei manga series see Karakuri Dôji Ultimo

Ultimo is a fictional giant robot in the Marvel Comics universe. It was once controlled by the Mandarin and used against Iron Man, but has fought Iron Man several times even when not under the Mandarin's control.

Ultimo is a gigantic android that is thousands of years old, and he was constructed by an alien species that has since been destroyed by their own creation. They called the robot "The doomsday device", apparently a combat instrument and a weapon of mutual assured destruction. Ultimo confirmed that his "masters" have not contacted him in "thousands of years".

The first time (chronologically speaking) Ultimo is depicted in print (in flashback in Iron Man vol.3, #24), he is already traveling through space, and has attacked the planet Rajak, ultimately killing all its people. The only survivors, a group of merchants who were off-planet at the time, attempted to destroy him, but had to flee before his might. In the end they managed to lure him into an asteroid belt, where both he and the ship were battered by space rocks until they were driven off-course and separately crash-landed on an unknown planet — Earth. This happened around the 1840s.

Ultimo (Marvel) has not been a contender in any CBUB matches.