Bonzilla the Lizard is a 10-inch, tall reptilian beast in Japan.
In "Retroville 9, Bonzilla is visited by the Retroville 9 after losing to another team in Japan. Sheen insults Bonzilla, resulting in him being burned into a crisp by Bonzilla's fire breath and he faints.
He reappears in Win, Lose and Kaboom. This time he is a lot bigger, almost the size of a man and is part of the audience.