Die Physiker (1964)

A private psychiatric clinic: three physicists are staying here. Two of them claim to be Albert Einstein and Isaac Newton, respectively. The third is named Johann Wilhelm Möbius. The scientist has discovered the world formula, which poses a great danger: whoever possesses it holds the key to the destruction of all humanity. By presenting a false story, Möbius has managed to take refuge in the asylum, but he could not have known that two agents posing as Einstein and Newton are there with him, intent on stealing the formula from him...