The White Tower

Paul Delambre

Andreas (as Oscar Homolka)

Dr. Nicholas Radcliffe (as Sir Cedric Hardwicke)

Mr. Hein

Mme. Astrid Delambre

Frau Andreas

Frau Knubel (uncredited)

Knubel (uncredited)

When scaling the last bit of the peak near the end, it's obvious that studio lights were being used as there are multiple shadows of Glenn Ford going in multiple directions.

Martin Ordway: Oh, what do we have here?

Mr. Hein: [Admonishing his fellow climbers for resting too frequently] To rest is not to conquer.