Theta

The Theta is final boss of the 2005 videogame Area 51. The creature was created by doctor Winston Cray, using an alien mutagen.

Origin
The Theta was developed for scientific study at the applications of the mutagen recovered from alien space-ships in area 51, however it would take on more fatal purposes later. When the Illuminati move in to take the research, Dr. Cray released the Theta rather than see his research fall into the hands of those who would misuse it. As Dr. Cray is killed by a bomb planted by the Illuminati, the Theta represents Dr. Cray's legacy of work, work he clearly did not wish unleashed upon the world.

Nature and Abilities
The creature's skeleton is titanium, reinforcing it to blunt-for trauma. It was given traits of various animals, including a tyrannosaurus-rex to maximize it's attack capabilities. The creature can even break-down basic chemicals in it's body to expel as an unclassified for of energy blast. The Theta's most feared trait is it's infectious nature, even one wound will fester and kill any normal human making it the ultimate sentient bio-weapon.

Behavior
The Theta is largely feral, it has no attachment to either Dr. Cray, the Illuminati or the player as Ethan Cole, it seeks only to destroy all that gets in it's way. The creature would produce an epidemic that over-came all of Area 51, which is what leads the protagonists of Bravo Team to be sent in.