Frank Merriwell (as Don Briggs)
Elsie Belwood
Bruce Browning (as John King)
Carla Rogers
House Peters
'Hersh' Mayall
Wally Reid
Eddie Arnold
Bryant Washburn
Allen Hersholt
Carlyle Blackwell
Peter Gowland
Harry
Charles Merriwell
Daggett
Mrs. Mary Merriwell
Murray Belwood
Coach Harding
Henchman Black
Jeff
Chemistry Professor
Indian John
Helpful Driver
Mrs. McLaw
Pete
Bill / Stalking Indian
Road Crew Foreman
Dr. Cummings
Captain of the 'Viking'
Big Tom
Barbecue Cook
Baseball Game Announcer
Lumber Camp Cook
Dance Party Guest
Slout
Theater Doorman
Football Player
Jimmy McLaw
Man in Audience (archive footage)
Dave
Mrs. Belwood
Yacht Captain
Man in Front Row (archive footage)
Second Mate of the 'Viking'
Berger
Monte
Rurale Captain
Yacht Crewman
George Baldwin
Indian
Gorman
Chief Tonaka
Prof. Baldwin
Pug O'Leary
Joe
Nolan
Judd
Lang