Mastaah is a major antagonist in Rabbids Rumble. Serving as the main villain and boss of the first world.
He, along with his associates, escapes from their apparent prison and go to their rumble world. Which the player must beat in order to reach him. In the final level of the world the player must defeat him in order to continue. After it is successfully done, he will be unlocked as a playable character.
- His name is a pun on the word Master, and the rabbids scream DAAAAAAAH!