Jonathan Harris and Al Lewis together. As a New Yorker, it's interesting to me that these actors were from, respectively, the Bronx and Brooklyn. As a kid, I considered Lewis' role here to be a variation on his Munsters character. He was a magician, instead of a vampire. The episode, while arguably silly, contains some touching moments between Will, Dr Smith and the Robot. Will was always able to see something positive in Smith, where nobody else could. The friendship between these two characters had much to do with the show's overall appeal. Interestingly, Billy Mumy had previously appeared on an episode of the Munsters.