Roger Quain, escorting two zoo-bound black panthers on the train from Milan to Paris, is unaware that a Western agent, Catherine Ullven, has hidden a microfilm in the collar of one of the animals. But when the train is derailed in the Swiss Alps and the panthers escape, she is forced to involve him in her mission, which now includes enemy agents hunting the microfilm, the animals, Catherine and Roger.
Howard Duff
as Steve Quain
Märta Torén
as Catherine Ullven
Philip Friend
as Chris Denson
Robert Douglas
as Stephen Paradou
Philip Dorn
as Paul Kopel
Walter Slezak
as Doctor Stahl
Kurt Kreuger
as Captain Heimer
Aram Katcher
as Georg
Ivan Triesault
as Assassin
Jay Barney
as Assassin
Otto Waldis
as Gormand
Carl Milletaire
as Ticket Clerk
