S1, E1: Stitch doesn't know how to take care of anything that is his or belongs to others. This reaches a climax after he breaks the shake machine at the Rental Shack, getting Nani into a lot of trouble with Mr. Wong. When "Richter" (experiment #513) is activated, the island is rocked with potentially devastating quakes, ones that could destroy the entire planet. Lilo and Stitch manage to chase down Richter and put a stop to his destructive quake making. In the end, Stitch learns to value what he has and things that belong to others. Richter is repurposed to replace the broken shake machine at Nani's rental shack.