This is a "Wild Mass Guess" entry, where we pull out all the sanity stops on theorizing. The regular entry on this topic is elsewhere. Please see this programme note.
Dietrich is an alien.
He says he was born "a long time ago, in a galaxy far, far away" while attached to a lie detector, and the lie detector says he's telling the truth. In another episode where Wojo says he thinks he saw a UFO, Dietrich strongly implies that he's an alien.
More and more people are becoming convinced that there is other intelligent life in the universe. And they recognize the possibility that these creatures may have already made exploratory journeys here. Some also believe that these aliens have already entered our society and at this very moment are living among us. gives knowing smile