An amphibious dinosaur found in the Pacific Ocean, the character appeared only once, as one of two antagonists in the film Terror of Mechagodzilla. Characters in the film state that the Titanosaurus was originally a gentle creature, not aggressive by nature; it was only under mind control that it became hostile. Titanosaurus shares its name with a real dinosaur species, though they do not share much beyond nomenclature. Titanosaurus more closely resembles a Spinosaurus or a Suchomimus than a real Titanosaurus. Toho's Titanosaurus is more like a Japanese version of the British giant movie monster Gorgo, sporting the same webbed ear-like appendages, and has a dorsal sail like that of Spinosaurus. Originally, Titanosaurus was going to be two separate monsters that would eventually form into one, but due to budget restraints, only one Titanosaurus suit was made.
Titanosaurus was found by Doctor Shinji Mafune. He told his colleagues about the creature he found and also told them he found a way to control it. They all thought he was crazy, thus he was shunned by the scientific community. Mafune's daughter, Katsura, was fatally injured so the Black Hole Aliens revived her as a cyborg, in return they asked Mafune to help them take over the world. He agreed so he could take revenge against those who did not believe him.
Titanosaurus and Mechagodzilla were sent out to destroy Tokyo, but Godzilla stood in there way. Titanosuarus and Mechagodzilla were able to get the upper hand. However he was later defeated by both the human's sonic wave(his one weakness) gun and Godzilla. He knocked off a cliff his fate is unknown.
As well as using teeth and claws to fight, Titanosaurus can, by employing his tail as a fan, generate winds strong enough to demolish buildings and hurl debris at great velocities. When used in the water, it creates whirlpools powerful enough to completely immobilize submarines, in addition to its use as a high-powered propeller and rudder.
Titanosaurus is quite hardy as well as a determined combatant, standing toe-to-toe and exchanging blows with Godzilla on a number of occasions, and in addition landing kicks and punches that propel his opponent great distances (seemingly in defiance of conventional physics). Though the latter's atomic ray, superior physical strength and extensive combat experience ultimately give him a decisive edge when facing Titanosaurus one-on-one, Mechagodzilla's timely interventions allow his ally to retain or regain the initiative, as necessary.
Terror of Mechagodzilla
Godzilla Final Wars