In "Slushy", Lilo and Stitch battled with Experiment 523 (Slushy) at Waialeale Peak (covered in snow) until he was eventually captured by Gantu, though they managed to get Slushy back after a brief struggle. Later, when Experiment 619 (Splodyhead) was sent to defeat Slushy at Gantu's ice palace, a long-drawn-out battle ensued between the two experiments. Eventually, Splodyhead was defeated when Slushy froze him into a block of ice. He was later freed and blasted a fireball into the sky at the top of Waialeale Peak to clear Slushy's snowstorms.
In "Angel", Stitch had become enamored with Experiment 624 (Angel) and eventually pursued her to the top of Waialeale Peak, where she managed to lure Stitch into a trap by locking him in a ship with her, Gantu, Reuben, and several experiments that she had reverted to evil with her siren song. However, as the ship begins to take off, Angel starts to feel guilt over betraying Stitch. When the now-evil experiments restrain Stitch and Kixx is about to land the fatal blow, Angel, realizing how much she loves Stitch, sings her song backwards to turn the evil experiments good again. The experiments then work together to disable the ship's navigation and bring it back down to Waialeale Peak.