Mega-Mix

Mega-Mix (or, as identified in the game, Monster) is the twisted result of an accidental fusion between Dr. Neo Cortex, N. Gin, Tiny Tiger, and Dingodile. It's the extra boss in Crash Bandicoot: The Huge Adventure when all crystals, gems, and relics are obtained. It was created when the Planetary Minimizer malfunctioned (courtesy of Crash) and fired a laser at the villains, causing them to combine and mutate into the twisted shape of the Mega-Mix.

The Mega-Mix is a combination of the left side of the head of Dr. Neo Cortex, the right side of the head of Dr. N Gin, the torso and arms of Tiny Tiger, and the legs and tail of Dingodile. After the transformation, Mega-Mix chased Crash through the hazardous space station, until Crash made it to the exit and escaped with a space motorcycle. Mega-Mix was "destroyed", when the space station exploded, separating the villians' bodies from each other. Mega-Mix is playable in Crash Bandicoot 2: N-Tranced in the multiplayer minigames.

Trivia

 * Mega-Mix is the only boss in the Crash series that is invicible. (Meaning that it has no hit points, so it can't be defeated)
 * When Crash collides into Mega-Mix with invincibility, it will not do anything.
 * After attacking Crash when he has no mask, it'll laugh.