The cast included, amongst others, Sir Laurence Olivier, Gregory Peck and James Mason.
Wikipedia contains spoilers
In the movie, a scientist clones Adolf Hitler several times over and attempts to have the boys each undergo the same childhood experiences that Hitler did.
The movie is particularly notable for its musical soundtrack by Jerry Goldsmith.
Other science fiction movies which deal with the subject of cloning include Multiplicity and Gattaca.
Plot
Miscellaneous
See Also: List of movies - List of actors - List of directors - List of documentaries - List of Hollywood movie studios