Marc is a French secret agent whose only weapons are judo and karate. With the help of his sidekick Jacques, the duo goes to protect a noted scientist from falling into the hands of a gang of underworld thugs. Marc finds love with one of the female gang members who turns out to be a double agent with the British Secret Service.
Jean-Claude Bercq
Marc Saint-Clair, aka 'le Judoka'
Marilù Tolo
Vanessa
Perrette Pradier
Dominique Berg
Patricia Viterbo
Catherine Demange
Michael Lonsdale
Thomas Perkins
Henri Garcin
Jacques Mercier
Mick Besson
Oscar Meyer, sound engineer
Fernand Berset
Commissioner Chaumont
Yves Brainville
Paul Vincent, the boss with the glass eye
David Tonelli
Claire Chevalier
The young singer (uncredited)
Georges Guéret
The mariner (uncredited)
