![]() | Merlin Jones, a precocious and intelligent high-school boy, experiments with hypnosis and creates a mind-reading machine. However, his experiments land him in deep trouble with the law. |
| Tommy Kirk | - | Merlin Jones |
| Annette Funicello | - | Jennifer |
| Leon Ames | - | Judge Holmsby |
| Stuart Erwin | - | Police Captain Loomis |
| Alan Hewitt | - | Professor Shattuck |
| Connie Gilchrist | - | Mrs. Gossett, Holmby's Housekeeper |
| Dal McKennon | - | Detective Hutchins |
| Norman Grabowski | - | Norman, Midvale Football Player |