In a season 10 episode of Happy Days, what soon-to-be-famous actor guest stars as a rival of Fonzie who is well-schooled in martial arts?

When Hanks appeared in Happy Days, he was only 26 years old, and it was right after his series Bosom Buddies had its short stint on the same network. In the episode, Hanks's character challenges Fonzie to a martial arts fight.

Asked by Tom Cohen · Last updated 5 years ago · 95K views