Amnesio is a small, blue beetle/cicada-like experiment with a round body, two thick arms, two thick legs, a purple mark on his stomach, two large wings on his back with purple spots on them, a round face with large black eyes, a little mouth and two thin antennae.
Powers and abilities
Amnesio can produce a red laser vision from his eyes that erases the memories of anyone hit in the eyes. If he hears the password ʻohana, the memories of all his victims will be restored.
Experiment 303 was the 303rd genetic experiment created by Jumba with Hämsterviel's funding. He was designed to erase his victims' memories with a red laser vision from his eyes. 303 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.
303's pod was used as a ping-pong ball by Keoni and another player until it got whacked off the table and into a little boy's bucket of sand. Thinking the pod was a marble, the boy put it on top of his sand castle. A small wave then splashed over the castle, activating 303, which caused the boy to flee the beach in terror.
303 then proceeded to erase people's memories, including a married couple whose wife clashed with her husband after losing her memory. Meanwhile, Lilo and Stitch handed out homemade invitations to the former's birthday party.
Gantu later tracked 303 down, but found it quite difficult to subdue the latter while he was airborne, as he managed to successfully evade all of Gantu's plasma blasts.
Gantu and 303's presence caught the attention of Lilo and Stitch. Grabbing a butterfly net, Stitch climbed a telephone pole to try to nab 303 as the latter perched on a power line, but he was instead captured in a containment orb by Gantu. Lilo, Stitch, and Gantu were soon fighting over the captive experiment, which ended with 303 wiping all three of their memories, leaving the trio dazed.
Plagued with amnesia, Lilo and Gantu decided to team up and figure out what to do with the captured experiment. Stitch, however, reverted to his original programming, while Lilo and Gantu assumed he was an escaped convict.
With their memories erased, Lilo and Gantu (dubbed Martha and Lenny) went after Stitch and did recreational activities together at some point. They later ran into Jumba and Pleakley, where 303 wiped both of their memories, but not before they explained to Lilo and Gantu exactly who was on whose team.
Lilo and Stitch then decided to team up to get their memories back. Lilo wanted Gantu to come along, but the latter was unsure of himself. After Lilo and Stitch discovered how to reverse 303's effects, Gantu set the experiment free. Lilo grew devastated, even though Gantu stated that he didn't want his memory back.
Luckily, Stitch was able to use his binocular vision to locate 303, and the trio chased him into a factory. Despite Gantu's protests, Lilo undid 303's effects by shouting out, "ʻOhana!" Although everyone got their memories back, Gantu managed to recapture 303 after a long pursuit and take off with him.
303, named Amnesio, was successfully sent to an inpatient Hämsterviel, where the former ended up erasing Hämsterviel's memory also. Gantu misleadingly described him as a dangerous criminal who had just been captured by Ace Jackson (Gantu) while admiring a pottery jar that read "World's Greatest Cop", which Lilo had made Gantu earlier.
Amnesio reappeared in "Snafu", and was freed along with Gantu's other captive experiments by Lilo, Stitch, and several other experiments in a rescue mission.
Later, the first 624 experiments, including Amnesio, 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.
Amnesio participated in the following battle between the experiments and the Leroy clones by erasing Leroys' memories.
However, 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.
Amnesio made an appearance in the Stitch! anime where he used his powers on BooGoo, Stitch, Jumba, Gantu, Reuben, and Hämsterviel. It is revealed that Amnesio holds the stored memories in pouches under his wings. If his victims ingest the pouch with their memories in it, everyone's memory will be fully restored. Only Amnesio knows whose pouch belongs to whom. Also, it is shown that when Amnesio's powers are used on Stitch, he reverts to his original programming since he is nothing but instinct in that state.
- Amnesio was first revealed in a DVD bonus feature of Stitch! The Movie in the experiment gallery.
- Amnesio is not referred to by his new name at any point in his debut, but his name officially appears on the experiment name list in Leroy & Stitch.
- In his debut, when Amnesio flies around in several instances, the song "Flight of the Bumblebee" is heard playing.
- The password which reverses Amnesio's mind-erasing effects is "ʻohana", a Hawaiian word that Jumba did not know of until well after Amnesio's creation.
- Amnesio is the first experiment to be caught by Gantu onscreen; Gantu had previously caught a "sock hider" and "pudding stealer".
- Amnesio's pod color is yellow.
- The Experiment Pod Container describes Amnesio as: "Experiment 303. Primary function: Erases memories."
- It seems that Amnesio specifically erases memories of personal identity and relationships with others. Victims still retain other learned behaviors, such as language and societal norms.
- Amnesio's head appears in the online game Jumba's Lab.