They Saved Hitler's Brain is a 1968 TV movie directed by David Bradley.
It was adapted for television from a shorter 1963 theatrical feature film, Madmen of Mandoras, directed by Bradley and produced by Carl Edwards.
The film was lengthened by about 20 minutes with additional footage shot by UCLA students at the request of the distributor.
World War II is over, and Nazi officials remove Adolf Hitler's living head and hide it in the fictional South American country of Mandoras, so that they can resurrect Nazi Germany in the future.
Fast-forwarding into the 1960s, the surviving officials kidnap a scientist with expertise in nerve gas in an attempt to conquer the world.