Julie's sister from Nebraska visits and enrolls at Buchanan. She wants to be in Gabe's class and develops a fondness for Epstein...much to Julie's dismay.

With the approach of Sadie Hawkins Day, where the girls ask the guys to the school dance, everybody, including Horshack, has a date - everyone but Barbarino.

A student teacher joins Kotter's class only to find that normal teaching methods don't work with the Sweathogs. Then she adopts Kotter's style only to find out that it doesn't work for her.