Evolvo-Ray

The Evolvo-Ray is a machine built by Dr. Neo Cortex and Dr. Nitrus Brio to evolve ordinary animals into mutants. It is unknown how Brio and Cortex got the animals to the lab, but they probably captured them in Australia, since the Wumpa Islands are off the coast of Australia. That explains why the animals are typical Australian animals like koalas and kangaroos.

Crash 1
The Evolvo-Ray first appeared in Crash Bandicoot 1. It was built by Brio, though due to his low self-esteem, he let Cortex take the credit for it. It was used to mutate the evil Ripper Roo, Tiny Tiger, Koala Kong, Pinstripe Potoroo,(and many others) Tawna, and the good Coco Bandicoot, Crunch Bandicoot, and, most importantly, Crash Bandicoot. It was supposedly destroyed when Crash burned down Cortex's castle at the end of the game.

Crash Twinsanity
The Evolvo-Ray did not appear again until Crash Twinsanity, though only a prototype version. Cortex had been trying to make it as a kid (before Brio sucessfully made it). Cortex's two test subjects were his parrots: Victor and Moritz. However, instead of evolving them, it sent them to the Tenth Dimension. Nevertheless, Cortex quickly got over the loss of his parrots (the only creatures he didn't "loathe or eat") and continued his studies. A newer version of the Evolvo-Ray appeared at the end of the game, where Cortex tries to dispose of Crash the same way he did with Victor and Moritz. However, the machine malfunctions and sends Cortex into Crash's brain.

Crash of the Titans
The Evolvo-Ray had a major appearance in this game. This time, it was powered by mojo. Apparently, it could not only make mutant soldiers, but also make them obey Cortex, Nina, N.gin, Tiny and Uka Uka (therefore making the Cortex Vortex useless). Uka Uka had been storing it in his base, creating the mutants there. When Crash and Aku Aku found the Evolvo-Ray, Uka Uka used it the mutate himself, giving him a body. Crash battled Uka Uka and jacked him with Aku Aku. While jacked, Crash made Uka Uka destroy the Evolvo-Ray, thus making Uka Uka lose his precious body.

Crash: Mind over Mutant
The Evolvo-Ray was briefly mentioned by Doctor Nitrus Brio, claiming to be the inventor of the Evolvo-Ray and other stuff that was used by Cortex. Despite this, the Evolvo-Ray made no physical appearance in the game.