Tom Hanks had a guest role

The 67-year-old Hollywood actor guest starred in the 1982 episode 'A Little Case of Revenge' as a former schoolmate of Fonzie. Now a doctor, and a karate expert, Dr. Dwayne Twitchell (Hanks) seeks revenge on The Fonz.

Hanks has revealed the small part got him his leading role in Ron Howard's 1984 blockbuster 'Splash', alongside Daryl Hannah, John Candy and Eugene Levy.