65 minutos
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.
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
