Bobby Henrey, the amazing juvenile star of The Fallen Idol, is here cast as 7-year-old musical genius Sebastian Giro. Mistreated by his avaricious adult manager, Sebastian runs away to a remote Alpine village. He then falls into the hands of a gang of kidnappers, led by the basically sympathetic Jack.
Unfortunately the movie The Wonder Kid is not yet available on HBO Max.
| Directing | Karl Hartl | Director |
| Production | Karl Hartl | Producer |
| Costume & Make-Up | George Frost | Makeup Artist |
| Sound | John Cox | Sound Supervisor |
| Sound | Willy Schmidt-Gentner | Music |
| Writing | Karl Hartl | Story |
| Writing | Gene Markey | Screenplay |
| Camera | Robert Krasker | Director of Photography |
| Camera | Günther Anders | Director of Photography |
