"Son of Sprout" is the Season 2 exclusive episode of Stitch!. It features Kijimunaa's sister as a guest character. The Experiment in this episode was Sprout (only in the Japanese version), and the new Experiment is the son of Sprout named Sproutling, also known as Experiment 509-A (only in the English dub).
At the start of the episode, a strange meteorite is shown heading right towards the Earth. In the ocean, Kijimunaa's sister is rowing the boat until she is bumped by Angel, but they are both saved by Stitch.
- In the Japanese version, Sprout didn't have an offspring, but in the English dub, he has a son.