|“||Mr. Fizzles wants to help Tess. He wants to listen.||”|
— Mr. Fizzles to Tess
in Party On, Garth
Mr. Fizzles is Garth Fitzgerald IV's puppet.
Mr. Fizzles is a sock puppet Garth uses during some of his hunts, namely for interrogating people who would rather stay quiet, such as children. He makes his debut in the Season 7 episode "Party On, Garth", when a witness to a shojo attack, Tess McAnn, refuses to talk, Garth "summons" Mr. Fizzles to speak in his stead. This convinces Tess to talk about the shojo that killed her mother.
- In "Torn and Frayed" Garth is revealed to own a safe boat, Fizzles' Folly, presumably named after Mr. Fizzles.
- After becoming a werewolf, it is unknown if Garth still keeps Mr. Fizzles.