| Buster Keaton | Sherlock, Jr./Projectionist |
| Kathryn McGuire | The girl |
| Ward Crane | The sheik/villain |
| Joseph Keaton | Her father |
| Erwin Connolly | The butler / handyman |
| Horace Morgan | Conspirator (uncredited) |
| Jane Connelly | The mother (uncredited) |
| Ford West | Theatre manager / Gillette (uncredited) |
| George Davis | Conspirator (uncredited) |
| Ruth Holley |
After a day of playing amateur sleuth, a movie projectionist ``projects'' himself into a film to solve a case.
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