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Firefly is an American space western drama television series created by writer and director Joss Whedon, under his Mutant Enemy Productions label. It premiered in the U.S. on the Fox network on September 20, 2002. Whedon served as an executive producer, along with Tim Minear. The series is set in the year 2517, after the arrival of humans in a new star system, and follows the adventures of the renegade crew of Serenity, a "Firefly-class" spaceship. The ensemble cast portrays the nine characters who live on Serenity.

It was canceled after eleven of the fourteen produced episodes were aired but due to its popularity after this, Whedon and Universal Pictures produced a film based on the series, Serenity. The Firefly franchise has expanded from the series and film to other media including comics and a role-playing game.