Ultimasaurus is a hybrid from the cancelled Kenner toy line Jurassic Park: Chaos Effect. It is made from the DNA of Tyrannosaurus rex, Triceratops, Velociraptor, Ankylosaurus, and Stegosaurus, making it a deadly fighting machine.
Its appearance gives it the head and body of a Tyrannosaurus, the frill and horns Triceratops, The arms and legs of a Velociraptor, the back armor of an Ankylosaurus, and the spine-tipped tail of a Stegosaurus. Its skin is primarily gray with, red, & yellow underbelly.