Wealthy scion Peter DeHaven, about to marry socialite Christine Lunceford, wakes up after bachelor party revelry to find he's been turned invisible by eccentric college professor Reginald Shotesbury. An unbelievable series of events is revealed by several witnesses testifying in a "mystery trial" to determine the reason for DeHaven's "disappearance".
| Actor | Role |
|---|---|
 Jeffrey LynnPeter DeHaven | Peter DeHaven |
 Jane WymanJoan Shotesbury | Joan Shotesbury |
 Edward Everett HortonProfessor Shotesbury | Professor Shotesbury |
 Herbert AndersonGeorge Appleby | George Appleby |
 Marguerite ChapmanChristine Lunceford | Christine Lunceford |
 Craig StevensRobert Struck | Robert Struck |
 David BruceJimmy Barbour | Jimmy Barbour |
 Willie BestWillie | Willie |
 Ivan F. SimpsonDean Claxton | Dean Claxton |
 Tod AndrewsBill | Bill |
 William HopperTerrence Abbott | Terrence Abbott |
 Natalie SchaferMrs. Lunceford | Mrs. Lunceford |
 Charles HaltonProfessor Moggs | Professor Moggs |
 Sidney BraceyBarrett | Barrett |
 Wade BotelerInspector Deming | Inspector Deming |
 Frank FergusonProfessor McAuley (uncredited) | Professor McAuley (uncredited) |