Calypso, otherwise known as Tia Dalma, is a major supporting character in the Kingdom Hearts Unlimited Saga, first appearing in "The Fantasmic Dreamtime" as a powerful voodoo sorceress summoned forth by Obi-Wan Kenobi and Master Yoda to help train and guide Mickey Mouse on his path to Keyblade Master status while also protecting the Realm of Sleep from the forces of darkness. She later makes her mark in "Return of the Keyblade", where she becomes an invaluable ally to Captain Jack Sparrow and the Black Pearl Crew Members in Jack's quest to rid himself of his cursed bondage to the powerful Sea-Reaper Davy Jones for the events of the Port Royale campaigns.
It is later revealed that Tia Dalma is in fact a second-generation Titaness born during the Lands of Legend, more specifically as the daughter of the Titan World-Bearer Atlas. Because of this, she has control over the very oceans which the pirates sail across for their raids, though Jones, her former love, begins to do all he can to try and keep her from reawakening her power in time for the Battle of Shipwreck Cove. He naturally fails, and despite Calypso's initial hostility to the Bretheren Court for imprisoning her long ago, she eventually comes around to give Fa Mulan her required Sailor Crystal Power upgrade to help give the Court the advantage against the Galactic Empire's forces.