Matthew Rhys Riley Greene Voice James Hong Grandpa Wing Voice Ming-Na Wen Fong Wing , Yin Voice BD Wong Hon Wing Voice Gabrielle Nevaeh Elle Voice A.J. LoCascio Gizmo , Bucky , Clam , Snout Jr. , Evil Mogwai Voice Izaac Wang Sam Wing Voice Tze Chun Executive Producer Justin Falvey Executive Producer Darryl Frank Executive Producer Brendan Hay Executive Producer, Writer Patrick Inness Producer Sam Register Executive Producer Danielle Witz Producer Vaughn Ross Director