Gibbs makes his debut along with Tia Dalma in their homeworld of the Caribbean, with events following what happened in At World's End. Gibbs is with Will, Elizabeth, Tia Dalma, Barbossa, and their crew, as they make their way into Davy Jones' Locker to find Jack and the Black Pearl, where they soon encounter Sora, Donald, and Goofy, who recognize Will, Elizabeth, and Barbossa, but have to be formally introduced to Gibbs and Tia Dalma. Once they reunite with Jack and the Pearl, they return to the Caribbean, where Sora learns that Davy Jones and Cutler Beckett are threatening to destroy piracy in the Caribbean. However, Sora soon has to make his way to Port Royal for repairs after his ship provided by Tia Dalma, the Leviathan, takes damage from the Heartless.
By the time he rejoins Gibbs and the others, Elizabeth has already been named Pirate King by the Brethren Court, and an attempt to appeal to help from Calypso revealed to be Tia Dalma in her bound human form, appeared to have been in vain. However, a stirring speech from Elizabeth to convince the crew of the Pearl to hoist the colors and show the Brethren Court that they are not afraid of Beckett's larger Royal Navy armada under the East India Trading Company flag convinces Gibbs and the others to fight back. Soon, Calypso makes her move to summon a maelstrom for the Black Pearland the Flying Dutchman to do battle in with Sora attempting to support the Pearl with the Leviathan. However, after Jack, Elizabeth, Sora, Donald, and Goofy are forced to leave a mortally wounded Will on the Dutchman as it goes down after Jack helped Will stab Davy Jones' heart in the Dead Man's Chest, Gibbs warns Jack that Beckett is approaching on his flagship, HMS Endeavour, and suggests retreating while they still have the chance. Jack refuses, hoping Beckett will keep his end of their earlier agreement, but Beckett has the Endeavour prepare to attack the Pearl before the Dutchmanresurfaces with Will its new captain. As Jack then gives the command to have the Pearl join the Dutchman in hitting the Endeavour in a double broadside, Beckett is left in a state of shock at having been outmaneuvered. On Jack's command, Gibbs relays the order to fire, and both ships unleash their fury on Beckett's ship. Beckett's Royal Marines abandon ship when they realize Beckett is unable to give orders and the Endeavour is doomed, and soon the powder magazines detonate, killing Beckett and finishing off the Endeavour. With the loss of their flagship and commander, the EITC/Royal Navy armada is forced to retreat in disgrace.
As the crew of the Pearl celebrate their victory, Sora notices Elizabeth gazing over at Will on the Dutchman, at which point, Gibbs explains to Sora that the Flying Dutchman must have a captain, and since Will is the new one, he's bound by the Dutchman to spend ten years ferrying the souls of the dead to the afterlife after spending one day on land, a steep price for their victory after having only become Elizabeth's husband a short while ago. Sora is left deeply upset by this, but Gibbs does his duty and provides a longboat for Elizabeth to travel ashore to spend her one day with Will before he starts his ten-year tenure at sea before he can set foot on land again. Afterward Gibbs stands with Barbossa, Donald, Goofy, and the crew as Jack assures Sora that the one day Will and Elizabeth have to say goodbye is enough time to bond, just like Jack and Sora do with their friends, family, and hearties.
Joshamee Gibbs made his first appearance in Pirates of the Caribbean: The Curse of the Black Pearl.
- Gibbs is the only Pirates of the Caribbean character in the franchise to be voiced by their original film actor.