Clyde Crashcup is a fictional character from the early-1960s animated television series The Alvin Show, a scientist in a white coat whose experiments invariably fail. His assistant is Leonardo.

Clyde appears in every invention segment as well as multiple comics, including specials and the Clyde Crashcup Dell series.

He also appeared in the special A Chipmunk Christmas (in a dream sequence) and the 1990 The Chipmunks Go to the Movies episode Back to Our Future, taking the modern day Chipmunks back in time to meet their 1958 selves although technically 1960s selves.

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