Deep Space

Deep Space (ディープスペース) is a world from Kingdom Hearts Birth by Sleep. It is based on the Lilo & Stitch films, specifically on the intergalactic portions. It is the most recent Disney animated feature to be incorporated into the Kingdom Hearts series, and the second-most recent feature overall (after Pirates of the Caribbean: The Curse of the Black Pearl).

Kingdom Hearts Birth by Sleep
Terra is the first person to appear in this world. After fighting a swarm of Unversed in space, he is swept onboard the Federation ship. He is placed, unconscious, in a prison cell and is visited by Captain Gantu and the Grand Councilwoman. He wakes up to a swarm of Unversed attacking the prison, breaks free, and fights the Unversed. He meets Dr. Jumba Jookiba who convinces him to unlock his cell so they can find Experiment 626, who is imprisoned somewhere on the ship. When they find him and release him, 626 snatches Terra's charm. When Terra refers to it as his bond with his friends, 626 drops it and runs, to Jumba's surprise. To demonstrate that his Experiments don't have hearts, Jumba activates Experiment 221 to fight Terra. After the fight, Experiment 221 becomes deactivated and 626 returns. Terra talks to 626 about friendship before alarms go off. 626 and Jumba run off while Terra leaves the world.

Aqua is the second person to arrive in this world. After fighting a group of Unversed as soon as she boards the ship, she meets Experiment 626, who runs off. She then meets Gantu, who brngs her before the Grand Councilwoman, who charges Aqua with destroying the Unversed on the ship and locating Jumba and 626. Aqua soon finds Experiment 626 and fights Unversed alongside him. 626 runs off again, and the Grand Councilwoman directs Aqua to the departure bays to capture Jumba and 626. When she finds them, she learns that 626 made a charm to copy Terra's. Gantu appears and attempts to destroy the three of them. Aqua and 626 fight Gantu for their freedom. After their victory, the Grand Councilwoman thanks Aqua for a job well done, and demotes Gantu. As she escorts 626 and Jumba away, Aqua then asks her to consider sparing Experiment 626's life. Before leaving, Aqua asks 626 to add her and her friends to his "bond".

Ventus is the last person here. He arrives on the ship after chasing a giant Unversed. He is confronted by Gantu, who runs off when the Unversed attacks the ship's engines. Ven then meets an escaped 626 and learns that he has met Terra and Aqua. Ven and 626 battle the giant Unversed attacking the ship. Gantu eventually finds them and plans to arrest Ven with Experiment 626, but they escape the ship, Experiment 626 in a red cruiser and Ven on his Keyblade. 626 accidentally activates his craft's hyperdrive, and Ven is blasted off his Keyblade as 626 disappears into space.

In the ending credits, Experiment 626 gets his toy and puts it on the steering wheel as he flies off through space.

Trivia

 * Wonderland and Deep Space are the only Disney-based worlds that are not set on "Earth". Halloween Town may or may not actually take place on Earth because in the movie The Nightmare Before Christmas, Jack is seen to visit the people of Earth and is attacked by the U.S. Army. However there isn't enough information to draw a definite conclusion on where it actually takes place.
 * Deep Space is now the only Disney-based world that is not based on the main setting of its film. The main setting would be Hawaii, which does actually appear in Stitch's summon sequence in Kingdom Hearts II. Neverland was once a case like this until Kingdom Hearts 358/2 Days, in which parts of the Island itself are explorable.
 * Deep Space is one of the few worlds to not actually be a world. It is a large spaceship capable of traveling to other worlds.