Remmy, A.K.A. Experiment 276, is an illegal genetic experiment created by Jumba Jookiba. He is designed to infiltrate victims' dreams and turn them into nightmares. If the victim wakes up while Remmy is still inside, he will remain within his host's mind forever to transform all future dreams into nightmares. His one true place is at Kimo's Arcade sending gamers into virtual realities of their fantasies. He is voiced by Jeff Bennett.
He was activated when a sea turtle threw his pod out of its nest and it landed in the path of an incoming tide.
Remmy is a light blue experiment with a huge head, a dark blue marking on top, little antennae, black eyes and a thin mouth that resembles a Pac-Man ghost and can fly.
Remmy can cause nightmares by entering through a victim's ear and infiltrating their dreams. Also, he was designed to attack at the peak of the person's subconscious enjoyment. If the victim wakes up while Remmy is still inside, he will remain there permanently to turn all future dreams into nightmares.
He can speak fluent English, but also has complete control over the mind once inside. This is proven when he displays the ability to show Yuna a forgotten memory.
If Remmy's host is reminded of something happy, the host will be able to turn the nightmare back into a dream, leaving Remmy weak and powerless.
His first apperance was in Season 2 in the episode "A Recurring Nightmare". As it is explained later in the episode, Remmy was happy in his one true place in Kimo's Arcade in Kauai, but was eventually abandoned due to the decreasing popularity of video arcades in favor of video games at home. Because of this, he reverted back to his evil, nightmare-granting ways.
He came to the island for revenge and despite Stitch trying to stop him, infiltrated Yuna's dreams. Jumba decides to send Stitch, Pleakley, and BooGoo into Yuna's dream to get Remmy out before Yuna wakes up and they're all trapped inside her dreams forever. Eventually, the group reaches the location where Remmy has his base set up. After getting inside, he challenges everyone to a quiz show, using Yuna's memories as the questions. After a few easy questions, he asks for the lullaby that Yuna's deceased mother used to sing to her when she was a baby. Unfortunately, Yuna doesn't remember, so they lose the game.
Remmy sends the group to three different locations in his base to play "virtual reality" games to make up for losing the quiz show. He sends Stitch to a racing game, Pleakley to a shooting game, and Yuna and BooGoo to a zombie-fighting game. Stitch and Pleakley both lose their games and wake up. Remmy and BooGoo are still in the dream, however, so Stitch, Jumba, and later Pleakley all go back to Yuna's dream to help. Seeing her treasured ohana fighting alongside her, Yuna gains control of her dream, giving Stitch the power to defeat all the enemies and weakening Remmy enough for Jumba to capture him.
Remmy regrets his actions and makes up for it by showing Yuna her deepest memory: her mother's face and lullaby. As Yuna starts to wake up, Remmy's base collapses, so Stitch, Pleakley, Jumba, Boogoo, and Remmy all leave Yuna's dream. In the morning, however, Remmy still needs someone to give nightmares to, so Jumba sends him to Hämsterviel to turn his dreams into nightmares.
In his second appearance, Remmy is sent by Hämsterviel to give Stitch nightmares so that Gantu and Reuben can have the chance to capture him and send him back to Hämsterviel. Therefore, Yuna and Jumba have to go inside Stitch's dreams while Pleakley keeps Stitch from waking up or becoming too agitated from the nightmares. They manage to capture Remmy at the last second before Gantu and Reuben can transport him.