(In one early appearance in the first season he was called "Glen", and was later credited on-screen as "Gregg" and "Tom", but he was playing the same character throughout.) Thomas Babson played "Tom", a law student often mocked by Cliff Clavin, for continually failing to pass the Massachusetts bar exam. "Al", played by Al Rosen, appeared in 38 episodes, and was known for his surly quips.