Slimy, A.K.A. Experiment 390, is an illegal genetic experiment created by Jumba Jookiba. He is designed to leave slippery slug trails. He was captured by Gantu, but was rescued in "Snafu". His one true place is making a sci-fi green waterslide at parties.
Experiment 390 was the 390th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to leave slippery slime trails for enemies to slip on. 390 and the other first 624 experiments were deactivated and smuggled to Earth by Jumba during his mission to capture Experiment 626.
The man later awoke and flicked 390's pod into the nearby swimming pool, activating the experiment.
In "627", 390 was tracked down and captured in a containment orb by Stitch. However, 627 was able to abduct 390 from Stitch and hand the experiment over to Gantu. 390, named Slimy, was later seen hanging out at Gantu's ship, where he shook his slime all over Reuben, much to the latter's disgust.
The first 624 experiments, including Slimy, were rounded up by Leroy and taken to a stadium to be destroyed. However, Lilo, Stitch, Jumba, Pleakley, Reuben and Gantu arrived before the experiments could be destroyed.
Slimy participated in the following battle between the experiments and the Leroy clones.
The Leroys soon gained the upper hand in the battle, but were defeated when Lilo, Stitch, Reuben and several other experiments performed the song "Aloha ʻOe", which caused the Leroy army to shut down due to the original Leroy's fail-safe.
Slimy is a large green slug-like experiment with black eyes on his stalk, a thin mouth, three spines on his back, and a semi-gelatinous body without legs or arms.
Slimy can produce a thick, slippery green slime similar to that of a snail.
- Strangely, Slimy seems to change from dark green and light green to dull blue and dirty clear. It is unknown how or why this happens, but he is shown twice in Leroy & Stitch like this, and his green version did not appear (although this could have been Clipse).
- Slimy also changes in size from large in Stitch! The Movie to small in "627", most likely due to releasing slime.
- Slimy's pod color is red.
- Slimy is described by the experiment computer screen as, "Experiment 390. Primary function: Slime producer".