In the book
Marlon Brando: The Biography by Peter Marso, it states that
Marlon Brando was "faced as he was with his still unfulfilled obligation" to "his ten-year old debt to [studio 20th Century] Fox, which would force him to begin shooting
Morituri in April 1964." Brando plays a Nazi soldier in this film as he had done so in the earlier
The Young Lions (1958) for 20th Century Fox, both movies being filmed in black-and-white and both being for made for the same studio.
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