Episode 449, the first appearance of Seth Armstrong. He's clearly another character that mellows over time. I've seen a lot of episodes from this era before, and it will take some time before Seth becomes more lovable. I think it's his relationship with Jackie that really makes him more sympathetic. In my opinion he always worked best in a fatherly way with younger characters like Jackie and later Biff, but also with Kim. I much preferred him like that over the comic relief role he was often put in.
Aunt Jessie also makes her first appearance in this episode. Her appearances were much too few. A wonderful character, a very typical battle-axe persona with a heart of gold underneath the gruff exterior. Done right that is always a favourite character of mine, and Kathleen Helme did it very right.