Clunk

The Clunk, also known as the Unenviable Clunk, is a character that appears in the Sonic Boom television series. He is the fictional protagonist of the Clunk superhero comic, and the mutated form of Bruce Bandicoot.

Appearance
As the Clunk, Bruce becomes several times larger and much more muscular. His fur also turns fully purple, his fingers become sharper, and his eyes become completely white. His fur also grows longer on his chins and arms.

Past
According to the Clunk comic series, the Clunk was created when Bruce Bandicoot got exposed to dangerous levels of "purple rays" during a lab accident. This caused Bruce to mutate into the Clunk for the first time.

Season two
Having read about the Clunk's origins in his comic book, Dr. Eggman was inspired to replicate the procedure that created the Clunk on himself to become more powerful, only for the procedure to turn him into a cuddly creature instead.

Trivia

 * Clunk is a parody of the Hulk, a character from Marvel Comics.
 * The Clunk's colors are an inversion of the Hulk's; instead of being green with purple pants like the Hulk, the Clunk is purple with green pants.