I thought that this was a haunting episode.

Notice how Carl Erich, before his treatment, makes these guttural grunts and moans, evoking images of some type of animal...and that's precisely describing the self-centered, inhuman, immature desires of those who were at the heart of Naziism. A very nice metaphor the scriptwriters and actor pulled off.

Sometimes I like hearing Mystery theatre episodes that are in a similar vein. In this case, I'd also recommend (sorry, don't have the episode numbers) "The serpent's tooth", "The rise and fall of the fourth reich" "The ghosts of yesterday" and "The memory killers". "The serpent's tooth" in particular has some similar (though more malignant) elements as "Goodbye Carl Erich".