Dioxis was a toxic gas used by the Trade Federation and the Confederacy of Independent Systems. Dioxis grenades were grenades that released the poisonous gas, and were used during the Galactic Civil War.
Dioxis fills The Box during the tournament on Serenno
During the Trade Federation's invasion of the planet Naboo, the Neimoidians attempted to kill Qui-Gon Jinn and Obi-Wan Kenobi by flooding a conference room of their Lucrehulk-class Battleship with the poisonous gas. However, both Jinn and Kenobi found their way out of the room and fled to Naboo.
During the Clone Wars, Count Dooku used dioxis as part of a contest on Serenno. Within an area known as the Box, eleven bounty hunters competed in a series of tests to prove whether they should be chosen as part of a team that would kidnap Supreme Chancellor Sheev Palpatine. The first task saw the competitors, which included a disguised Kenobi, having to escape a room that was being flooded with the gas.
Dioxis first appeared in the 1999 film Star Wars: Episode I The Phantom Menace, the first installment of the Star Wars prequel trilogy.
For the Star Wars: The Clone Wars episode "The Box," it was originally intended to fill the chamber of the first challenge at the Box with water instead of dioxis. According to supervising director Dave Filoni, however, when they wrote the story, they had yet to solve water, leading the production crew to drop water in favor of dioxis. Though they eventually solved for water, the constrained FX budget for the episode necessitated sticking with dioxis.
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