Gatt starred in the ABC's Swap Shop in 1990, and in 1994 was cast as Bradley in the pilot for The Bastards Next Door.
In 1995 he began hosting the morning cartoon show Cheez TV for Network Ten, and in 1997 made his film debut in Blackrock.
Later that year he started hosting the late-night music program Ground Zero but was released from the show in July 1998.
Gatt and his former Cheez TV co-host Lappin were special guests at AVCon in 2011, which ran from 22 to 24 July for that year.
AVCon is an anime and video games convention that is held yearly in Adelaide, South Australia, during July.