Ultimasaurus

Name meaning	"Ultimate lizard"
Code name	Ultima
Hybrid of	Tyrannosaurus rex + Triceratops + Velociraptor + Kentrosaurus
Diet	Carnivore
Birth type	Egg
Toy appearances	Jurassic Park: Chaos Effect (Juvenile, adult canceled)

Ultimasaurus is a dinosaur hybrid from the cancelled Kenner toy line Jurassic Park: Chaos Effect. It is made from the DNA of Tyrannosaurus rex, Triceratops, Velociraptor, and Kentrosaurus, making it a deadly fighting machine.

Its appearance gives it the head and body of a Tyrannosaurus, the frill and horns of a Triceratops, the arms and legs of a Velociraptor, the back armor similar to that of a Ankylosaurus and the spine-tipped tail of a Kentrosaurus. Its skin is primarily gray with a light yellow underbelly, black stripes on its back and armor plating, yellow markings surrounding the eyes, and a red head and feet. The way the lime green eyes are placed on the head gives it the binocular vision of a Tyrannosaurus. It was bred to be the most deadly of all the Chaos Effect hybrids, but proved to be extremely unpredictable.^{[citation needed]} Unfortunately, the figure was never released due to the fact that the Chaos Effect line sold poorly and some rumors also state that the horns were too long and sharp. However, an infant Ultimasaurus did come with one of the human action figures in this toy line, perhaps as a reference to Junior from The Lost World: Jurassic Park. An image of Ultimasaurus can be seen on many figure card backs, referencing that it would have had movable jaws and claws.

Behind the scenes

Concept art of Ultimasaurus

A repaint of this toy was planned for the Night Hunter Series, but was cancelled.

The design of the Tyrannopede, a Nemetrix alien from the Ben 10: Omniverse series, was based on this hybrid. According to the show's art director Derrick J. Wyatt, the scientific name for Tyrannopede's species is Kaosseffexx ultimasauria (the species name refers to the Ultimasaurus, while the genus name refers to the Chaos Effect toy line) and their family and parental behavior is similar to that of the Tyrannosaurus parents from The Lost World: Jurassic Park.

Many fans have noted the similarities between Ultimasaurus and the Indominus rex, another hybrid from Jurassic World, especially in terms of purpose.

Fans have noted that the hybrid, Pachygalosaurus in Jurassic World: The Game looks like Ultimasaurus, as well as the Allosinosaurus and Thoradolosaur in Jurassic World: Alive.

Gallery

Ultimasaurus hatchling with Roland Tembo

Trivia

• There has been a lot of speculation about which dinosaurs made the Ultimasaurus. Common guesses include Stegosaurus, Ankylosaurus, Torosaurus, and Therizinosaurus, among others. But as you can see from the picture on the toy box, Ultimasaurus is a mixture of four dinosaurs. Ultimately, Chaos Effect Magazine Ad provides the right source of genes.
  • However, the back armor of Ultimasaurus is completely unlike that of Kentrosaurus, and instead resembles that of Ankylosauria. This may indicate that the reference in the Chaos Effect Magazine Ad was based on an early design, and changes were made to the toy's design during the production process.