Herman's Hermits' first film, in which the British band has the chance to have an American spacecraft named for them.
| Actor | Role |
|---|---|
 Peter NooneHerman | Herman |
 Karl GreenKarl | Karl |
| KKeith HopwoodKeith | Keith |
| DDerek LeckenbyDerek | Derek |
| BBarry WhitwamBarry | Barry |
 Shelley FabaresLouisa Page | Louisa Page |
 Sue Ane LangdonCecile Bannister | Cecile Bannister |
 Herbert AndersonEd Lindquist | Ed Lindquist |
 Bernard FoxDudley Hawks | Dudley Hawks |
 Harry HickoxColby Grant | Colby Grant |
| HHortense PetraHenrietta Page | Henrietta Page |
| MMickey DeemsPublicist | Publicist |
| RRay KelloggDetective #1 | Detective #1 |
 John HartDetective #2 | Detective #2 |
 Phil ArnoldPhotographer | Photographer |
 Bill BaldwinTelevision Newscaster (uncredited) | Television Newscaster (uncredited) |
| RRobert NunnBoy on Airplane (uncredited) | Boy on Airplane (uncredited) |
 Jeffrey SayreBenefit Attendee (uncredited) | Benefit Attendee (uncredited) |