Eric Portman
(Dr. David Sorel)
Ian Hendry
(Paul Du Pre)
Peter Wyngarde
(Hugo de Croissillon)
Jeanette Sterke
(Eliane de Croissillon)
Philip Locke
(Vedoni)
Michael Coles
(Armidal)
Roger Delgado
(Dr. Si Cada)
Wolfe Morris
(Lieutenant Vinh)
Patrick Barr
(General Palice)
Anne Blake
(Francesca)
Zoe Randall
(Dr. Marianne Lagny)
Myrtill Nádasi
(Maria)
Frank Gatliff
(President of the Court)