Dr. Laurence "Larry" Erhardt is one of the two original villains on the cult television show Mystery Science Theater 3000. He was played by Josh "J. Elvis" Weinstein.
Dr. Erhardt is mad scientist and was Dr. Clayton Forrester's first assistant. He is a very different character from Forrester's later assistant, TV's Frank. He is more high-spirited than Frank, speaks with a high, squeaky voice, has curly black hair, and thick glasses. Erhardt is himself a "mad scientist" like Forrester, whereas Frank is neither a scientist nor, for the most part, mad. Just like Frank, however, Erhardt goes through many tortures by Dr. Forrester. His catchphrase was to, after soberly describing a horrible movie's plot or some other dire scenario, cheerily proclaim "Enjoy!"
Little is known of Erhardt's past save that he became a "mad scientist" while working at a zoo; he went mad when, in his own words: "...they promised me students, but all I got were monkeys! Monkeys! Monkeys! So I took off my wetsuit, dropped that hedge clipper, and walked out of that zoo forever!" Any additional details are left for the viewers to fill in themselves since MST3K was, after all, "just a show".
Eventually finding employment at Gizmonic Institute, he became Dr. Forrester's assistant and worked with him to launch Joel Robinson into space, where the pair conducted their movie-watching experiments on him.
Dr. Erhardt was only on the show for the KTMA season and the nationally telecast Season 1. When Frank was first introduced on the show and Joel asked what happened to Dr. Erhardt, Frank simply held up a milk carton with Erhardt's picture on it saying, "He's missing". Later, in episode #313, the featured movie ("Earth vs. the Spider") includes a scene in which a policeman closely resembling Erhardt is eaten by a giant spider, and Joel and the bots speculated that this was the true fate of Erhardt.