Jango's Dance Carnival

Jango's Dance Carnival is an animated short coupled with the Toei anime's second movie, Clockwork Island Adventure. It primarily serves as a showcase for the song "Ready!" by Folder 5 (who had previously preformed the anime opening "Believe").

Summary
Threadbare and starving, Jango seeks refuge on Mirror Ball Island, famed for hosting the largest dance festival in the East Blue. Finding the island's "beat" too much to resist, he soon makes a spectacle of himself at a local bar, causing a squadron of Marines to give chase.

By chance, the pursuit collides with another group of (in)famous visitors: the Straw Hat Pirates. Despite their best efforts, Luffy is soon spotted, forcing the whole crew to flee as well. While they divert a fraction of the Marines, Jango desperately scales the island's main dance platform and, flashing his hypnotic ring against the giant disco ball hanging overhead, orders everyone to dance.

Augmented by the disco ball, Jango's hypnosis seizes everyone - the Marines, the Straw Hats, hundreds of civilians, and even Jango himself. Together, they dance the night away, their synchronized steps eventually tearing the whole island apart.

Some time later, the hypnosis wears off, and the exhausted Straw Hats manage to escape on the Going Merry. To their dismay, however, they realize Luffy has been left behind, still dancing on the remnants of the disco ball with an equally carefree (and apparently still-hypnotized) Jango.

Cast

 * Mayumi Tanaka as Luffy
 * Kazuya Nakai as Zoro
 * Akemi Okamura as Nami
 * Kappei Yamaguchi as Usopp
 * Hiroaki Hirata as Sanji
 * Wataru Takagi as Jango
 * Tetsu Inada as Marine Captain
 * Mahito Oba as MC.

Trivia

 * Continuity-wise, this short could take place anytime between the Arlong Park Arc and the Laboon Arc: the Straw Hat Pirates consist of all five East Blue members and the Going Merry, no mention is made of the Grand Line or Vivi, and Jango's bounty is still active.
 * This short was likely inspired by the Jango's Dance Paradise cover arc, particularly in its emphasis on (the otherwise manga-exclusive) Mirror Ball Island.