Lilo & Stitch: The Series (2003)

S1E5 Holio

In the episode titled "Holio," it's Mertle's birthday, and she proudly showcases her shiny new bracelet. Unbeknownst to her, Lilo discovers that the bracelet contains an experiment pod, though she is unaware of its designation. Stitch decides to go undercover to investigate and finds out it's Experiment #606. With the potential for worldwide chaos looming, Lilo realizes she must retrieve the pod before #606 unleashes its power!