Happy Days S01 E15 Knock Around the Block

"Those were the days of the 1950's...filled with innocence and the promise of even better days to come."

Richie gets on the good side of a local gang, the Dukes, when he protects the leader's sister from being picked on. However, things change when the Dukes steal Potsie's bike, and Richie tries to get it back.