Mr. Munch debuted in 1978 at the 2nd Pizza Time Theatre restaurant. He replaced Crusty the Cat. He was originally voiced by Scott Wilson. On Portrait/Shelf Stage, Munch was placed behind closed doors, similar to Pasqually. He originally had a scratchy voice, which later became a deep voice, before reverting back to the scratchy voice. He was originally portrayed as slower witted than the other characters. When the Rocker Stages and C-Stages debuted in 1987 and 1988, Munch was placed inside of a window, as was done with Pasqually. When Concept Unification occurred, Mr. Munch replaced Fatz Geronimo from ShowBiz Pizza as pianist and band leader.