Sidney Pythias is a bumbling janitor picked up by cop Mike Damon as a teenage gang member worth saving from delinquency. With Damon's help, Sidney works his way through the Police Academy to become a cop too.
| Actor | Role |
|---|---|
 Jerry LewisSidney L. Pythias | Sidney L. Pythias |
 Darren McGavinMike Damon | Mike Damon |
 Martha HyerMartha Henshaw | Martha Henshaw |
 Robert IversMonk | Monk |
 Horace McMahonCapt. Riley | Capt. Riley |
 Richard BakalyanArtie | Artie |
 Joe CoreyHarry | Harry |
 Mary WebsterPatricia | Patricia |
 Milton FromeMr. Herman | Mr. Herman |
| JJefferson Dudley SearlesMr. Crow (as Jefferson Searles) | Mr. Crow (as Jefferson Searles) |
 Dave WillockWilliam C. Goerner | William C. Goerner |
 Frank GorshinNeighborhood Street Punk | Neighborhood Street Punk |
 Emile MeyerSgt. Kelly | Sgt. Kelly |