| Jon Hall | John Caldwell |
| Louise Allbritton | Virginia McCooley |
| Eric Blore | Nelson |
| Buster Keaton | Bus Driver |
| Irene Ryan | Miss Jones |
| Rudy Wissler | Walter McCooley |
| Gerald Perreau | Joey McCooley |
| Charles Bates | Larry McCooley |
| Don Davis | Pete McCooley |
| Florence Lake | Miss Lake |
| Chester Clute | Percy |
| Sarah Selby | Mrs. Lovelace |
| Fern Emmett | Mrs. Callope |
Members of a large family peddle an invention to a research institute.
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