Boss Cass the Cassowary is the main antagonist of the Ty the Tasmanian Tiger series. He is an evil cassowary who often tries to do something that will end in him achieving world domination. In Ty the Tasmanian Tiger, he wants to steal the Mystic Talismans and fails to do so at first, as Ty's father releases them right before he was imprisoned. After sealing Ty's family away, he begins to search for the talismans again, but is stopped by Ty.