All Grown Up! (2003)

S3E4 Curse of Reptar

Title: Reptar's Revenge Plot: After Stu cashes in on one of his inventions, he excitedly announces to the kids that he's installing a brand-new swimming pool. While the crew breaks ground in the yard, they stumble upon the old mechanical Reptar toy that once belonged to the Rugrats. Nostalgic, the kids initially plan to toss it aside, but when an intense electrical storm hits, they start to feel they've upset Reptar. They quickly change their minds, opting to save the toy and come to the realization that even as they grow up, their cherished memories remain unforgettable.