With Kotter away on a teacher's conference, the Sweathogs decide to spend quality time with a pregnant Julie. However, Julie is not so thrilled with all the attention from the Sweathogs.

Epstein spies a sexy art teacher kiss Kotter and assumes that Kotter is cheating on Julie.

The Welcome Back, Kotter flashback episode. The Sweathogs throw Kotter a surprise party before the start of the new semester. During the party, Kotter and the Sweathogs reflect back on all the good times they had over the first two seasons.