Richie is named R.O.T.C. squad leader but has trouble controlling his squad. After several warnings to obey his commands, he puts them all on report.

Richie and the guys organize a time capsule for a school project. Howard agrees to let them use the vault at his store for the capsule, and Potsie accidentally locks them all inside.

Richie makes a lucky shot to win a basketball game and suddenly becomes a big hero.

Richie, Fonzie, Potsie, and Ralph receive notices from the army to report for physicals.

Fonzie and Howard are picked for jury duty. The case appears cut and dry, but Fonzie isn't so sure. Meanwhile, Richie, Potsie, and Ralph practice for a fraternity festival, and Marion is to hold a paint sale at the hardware store in Howard's absence.

Needing extra money, Chachi begins selling Incredo-Wax, a miracle product that will shine anything. Unfortunately, it has disastrous side effects and ruins everything it touches.

The merchant seamen are in town, and with them is Rico, a sworn enemy of Fonzie. Fonzie is primed to fight, but Father Delvecchio makes him promise not to.

Howard puts on a burlesque show for his Leopard Lodge with the hope that it will earn him the honor of being the Grand Poobah. The show is in jeopardy of being halted when the girls hired for the show are snowed-in in Buffalo, New York.

Richie goes to a Leopard Lodge convention with Howard in Chicago despite wanting to go to a Bears game with Potsie and Ralph.

Howard's Uncle Joe, after reading Richie's report on the 1920s, tells him a story about what really happened during Prohibition.

Ralph's parents are getting a divorce, and Ralph becomes depressed.

Meanwhile, Marion practices for her upcomming role as the witch in a Hansel & Gretel play.

Despite Howard's objection, Joanie decides to buy a car because she and Chachi are tired of having to double-date, and Chachi cannot afford to buy his own.

Al is chosen to head the Leopard Lodge's annual Poobah Doo Dah when he says he can get his distant cousin, Frankie Avalon, to perform. However, as Al is auditioning other acts to round out the show, Avalon calls to say he can't make it.

With the recent death of a fellow Leopard Lodge member, Howard fears that he may be ousted as Grand Poohbah for not attracting any new members other than Potsie during his five-year reign. He gets Fonzie, Chachi, and Roger to join as pledges, and they have to follow the orders of Potsie during their initiation.