On a cattle drive Hoppy, camp cook Windy, companion Lucky, and young Artie Peters encounter an eccentric professor. The professor professes to be searching for the evolutionary missing link, but in reality he is a cattle rustler who uses his dynamite to scatter the cattle in order capture some of them. Hoppy and Bar 20 guys ultimately capture the professor.
Cast
William Boyd
Hopalong Cassidy
George 'Gabby' Hayes
Windy Halliday
Russell Hayden
Lucky Jenkins
Nora Lane
Nora Blake
Harry Worth
Horace Hepburn
Lois Wilde
Laura Peters
Billy King
Artie Peters
William Duncan
Buck Peters
Jack Rutherford
Blackie
Ernie Adams
Keno
John Beach
Pete
Ben Corbett
Henchman
Frank Ellis
Dirk
Leo J. McMahon
Bar 20 Cowhand
Artie Ortego
Henchman
Blackjack Ward
Slim
Crew
Lesley Selander
Director
Norman Houston
Screenplay
Clarence E. Mulford
Story
Robert B. Warwick Jr.
Editor
Russell Harlan
Director of Photography
Derwin Abrahams
Assistant Director
Theodore Joos
Assistant Director
Harry Sherman
Producer
Earl Sitar
Sound
Ben Corbett
Stunts
Leo J. McMahon
Stunts
Ted Wells
Stunts
Ralph Ravenscroft
Production Manager
Lewis J. Rachmil
Art Direction
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