Clyde Crashcup (voiced by Shepard Menken ) is a fictional character from the early 1960s animated television series The Alvin Show. His was the only voice heard in most episodes, because the other character in the series was his assistant, Leonardo, who only spoke into Clyde's ear. In one episode, though, Clyde invented a wife; her voice was provided by June Foray. Clyde had one of the four segments, and the Chipmunks starred in the other three (two of which were sing-alongs).

He appeared in the following episodes:

• Crashcup Invents Jokes
• Crashcup Invents Self-Presentation
• Crashcup Invents Glass
• Crashcup Invents the Chair
• Crashcup Invents the West
• Crashcup Invents Baseball
• Crashcup Invents the Bathtub
• Crashcup Invents the Wife
• Crashcup Invents Flight
• Crashcup Invents the Baby
• Crashcup Invents the Stove
• Crashcup Invents Music
• Crashcup Invents First Aid
• Crashcup Invents Electricity
• Crashcup Invents Egypt
• Crashcup Invents the Bed
• Crashcup Invents the Telephone
• Crashcup Invents Do-it-Yourself
• Crashcup Ivnents the Time Machine
• Crashcup Invents the Shoe
• Crashcup Invents Physical Fitness
• Crashcup Invents the Ship
• This is Your Life, Clyde Crashcup
• Crashcup Invents the Birthday Party
• Crashcup Invents Self-Defense
• Crashcup Invents Crashcupland