On vacation at his ranch, western actor Roy quickly finds himself involved with a horse rustling operation and a boy ward of one of the rustlers, leading to the kidnapping of Roy's trick horse Trigger by the gang with a demand for ransom.
Unfortunately the movie Under California Stars is not yet available on HBO Max.
| Writing | Sloan Nibley | Screenplay |
| Directing | William Witney | Director |
| Writing | Paul Gangelin | Story |
| Writing | Paul Gangelin | Screenplay |
| Camera | Jack A. Marta | Director of Photography |
| Production | John Grubbs | Production Manager |
| Art | John McCarthy Jr. | Set Decoration |
| Crew | Post Park | Stunts |
| Art | Frank Hotaling | Art Direction |
| Crew | Howard Lydecker | Special Effects |
| Crew | Joe Yrigoyen | Stunts |
| Production | Edward J. White | Associate Producer |
| Sound | Mort Glickman | Original Music Composer |
| Art | George Milo | Set Decoration |
| Sound | R. Dale Butts | Original Music Composer |
| Sound | Herbert Norsch | Sound |
| Crew | Theodore Lydecker | Special Effects |
| Sound | Ernest Gold | Original Music Composer |
| Editing | Tony Martinelli | Editor |
| Sound | Nathan Scott | Original Music Composer |
| Directing | Jack Lacey | Assistant Director |
| Costume & Make-Up | Bob Mark | Makeup Department Head |
| Crew | David Sharpe | Stunts |
| Crew | Fred Graham | Stunts |
| Costume & Make-Up | Adele Palmer | Costume Supervisor |
