Ultimate Humungousaur is the evolved form of Humungousaur.
Ultimate Humungousaur is strong and can withstand a fair amount of punishment. He has shell spikes and can use his tail like a mace and swing it at enemies. He can generate missiles from his forearms when they are turned into missile launchers. He can alter his forearms at will.
Ultimate Humungousaur is very much like a tortoise combined with an ankylosaurus. He has green skin and wears the evolved Ultimatrix symbol on his chest.
Ben 10: The Alien Generation
Ben 10: Ultimate 4 Alien