Experiment 305 was the 305th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to be 066's assistant.
305 and the other first 624 experiments were deactivated and smuggled to Earth by Jumba during his mission to capture Experiment 626.
All of the experiment pods were released and scattered across the island of Kauai.
At the unknown point, he was activated, captured, tamed and named Spunky.
- Spunky is seen in his pod form in Lilo & Stitch 2: Stitch Has a Glitch special feature the experiment profiler.
- Spunky's pod color is purple.