Bowser

Bowser is a horrible, evil genetic mutation gone wrong, set loose to invade the poor town of Tokyo. However, he got lost on the way there, and ended up in the Mushroom Kingdom where he survives on a regular diet of Toads, heroic plumbers, and the occasional appendage of one of his offspring.

Meanwhile, the casting directors had to find a replacement for him for their movie so they hired another horrible, evil genetic mutation gone wrong, named Godzilla, and paid him double. Bowser has reportedly filed a lawsuit against Godzilla, who proceeded to eat it.

It has been speculated that Bowser is actually Boswer and both were created by Evil Guy.