Gargantosaurus

The Gargantosaurus is the hybrid member of a race of alien shapeshifters that arrived on Earth, at the age of dinosaurs.

Biology
The Gargantosaurus is a cuadrupedal reptile of enormous dimensions, with red scaly skin, clawed feet, a long tail and a lipless mouth full of sharp teeth.

History
65 millon years ago, a species of shapeshfiting-extraterrestrial creatures arrived on Earth, during the Cretaceous.

Many members of the species take the form of dinosaurs and mammals, in order to camouflage with the animals. When dinosaurs got extinct, the aliens lose their shapeshifting abilities and got stuck in their changed forms, while some of his hybrid offspring retained the shapeshifting abilities.

One of these hybrids, named "The Beast" (by the novel's narrator) got frozen into a giant ice block, until he was thawed and released from its ice prison in the modern age. This beast would be called Gargantosaurus by humans, whom he mixed up taking the identity of the human mogul, Gareth Brontmore to go unnoticed.

Appearances

 * Saurian (1988)