After Stu sells an invention, he tells the kids that he's splurging on a built-in swimming pool. While digging up the yard, the construction crew unearths the Rats' old mechanical Reptar toy. The kids fondly remember it, but decide to throw it away, until, during an electrical storm, they become convinced that they've angered Reptar. They ultimately decide to rescue the toy, and realize that, although they're growing up, they can't forget their past.

Susie thinks that Angelica doesn't think much about the future. While Angelica worries about getting a navel piercing, Susie tries to get a scholarship to a good college. So when a school field trip accidentally leaves the two girls stranded in the big city, who will end up having the smarts to get them back safely?

When Susie gets chosen to sing at a big parade in New York City, the tweenage Rugrats hit the road with their moms on a cross country trip! Will Betty's clunky old motor home be able to make it to NYC and see all the stops along the way (like the world's biggest ball of yarn)? Will Tommy and his pals go crazy from lack of video games and TV? Will Chuckie finally get kissed?

Phil has a crush on Lil's best friend and soccer teammate Wally they start hanging out more often, making Lil feel out of the loop. So Lil develops a plan to pull them apart. Phil and Wally's relationship fell apart when Lil told Wally that he does not like her. When Phil finds out that Lil lied to Wally, he becomes upset at his sister.

Angelica's teacher is having a baby so she brings in a hot handsome substitute teacher that Angelica falls in love with. She tries to date him by failing her assignments. Meanwhile, Tommy, Phil, and Chuckie are part of the tennis club run by Pangborn. Chuckie is trying to avoid showering at the boys' locker room, but when he takes the chance, he realizes he has nothing to worry about.