"Calvin the C-Bomb" is a minor alter ego of Calvin's. It appeared in a single weekday strip. The C-Bomb appeared as a stout torpedo-shaped with fins and Calvin's face. It had "the explosive power of a million atom bombs", being dropped onto a city down from an aircraft's bay doors.
The C-bomb was analogous to Calvin preparing to smash something with a baseball bat. He was stopped by his mother before he could carry out whatever his plan was.