The Mysterious Doctor

John Loder

As Sir Henry Leland

Eleanor Parker

As Letty Carstairs

Bruce Lester

As Lt. Christopher 'Kit' Hilton

Lester Matthews

As Dr. Frederick Holmes

Forrester Harvey

As Hugh Penhryn

Matt Willis

As Bart Redmond

Phyllis Barry

As Ruby

David Clyde

As Tom Andrews

Clyde Cook

As Herbert

Art Foster

As Saul Bevans