They Saved Hitler's Brain

BE FORWARNED1 This is a case where the movie poster is better than the movie.
Doctored version of Madmen of Mandoras, in which Nazis saved Hitler’s head and are keeping it alive in a fish-tank until they can bring the Fuhrer back into power, ostensibly with a new body.

1968 TV movie directed by David Bradley. It was adapted for television from a shorter 1963 theatrical feature film, Madmen of Mandoras, produced by Carl Edwards and directed by David Bradley. The film was lengthened by about 20 minutes with additional footage shot by UCLA students at the request of the distributor. It is often cited as being one of the worst films ever made.