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William Boyd as Hopalong Cassidy |
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Andy Clyde as California Carlson |
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Rand Brooks as Lucky Jenkins |
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Robert Emmett Keane as Professor Dixon |
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Jane Randolph as Jessie Dixon |
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Fred 'Snowflake' Toones as Speed |
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Steve Barclay as Bruce Landy |
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Harry Cording as Duke |
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Earle Hodgins as Sandler |
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Robert Bentley as Barton |
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William 'Wee Willie' Davis as Blackie |
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Forbes Murray as Colonel Jed Landy |
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Glen Gallagher as Lieutenant |
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Ben Corbett as Sergeant |
| Directing | George Archainbaud | Director |
| Production | Lewis J. Rachmil | Producer |
| Art | Harvey T. Gillett | Art Direction |
| Crew | Mack Stengler | Cinematography |
| Editing | Fred W. Berger | Editor |
| Sound | David Chudnow | Music |
| Art | George Mitchell | Art Direction |
| Sound | Harry Lindgren | Sound |
| Writing | Doris Schroeder | Screenplay |
| Writing | Clarence E. Mulford | Characters |
