Synopsis by Hal Erickson
Lost in Space meets The Munsters as former "Grandpa Munster" Al Lewis guest stars as Zalto, a somewhat seedy space sorcerer. In hopes of flying Zalto's spaceship back to earth, Dr. Smith (Jonathan Harris) offers his services as the sorceror's apprentice. Unfortunately, the combined bungling of Zalto and Smith ends up seriously imperiling the Robinson family. This episode is highlighted by a wheezy vaudeville routine between Jonathan Harris and Al Lewis, reportedly improvised on the set when the script came up a bit short.