Buttercup

Buttercup is a giant bulldog mutant. Its first appearance is in the video game Teenage Mutant Ninja Turtles: Dark Horizons, where it, at first, chases the player from the left of the screen to the right. Later, it serves as the game's first boss. Buttercup sports a joint wraps, a chain, a spiked collar, and a skull motif.

It is unknown if Buttercup is a game-exclusive character, or will later show up elsewhere.