Serenity (2005) is a space western film directed by Joss Whedon, serving as a continuation and conclusion to the short-lived TV series Firefly. The film stars Nathan Fillion, Gina Torres, Alan Tudyk, Morena Baccarin, and Summer Glau.

The film picks up where the TV series left off, following the crew of the spaceship Serenity as they navigate a galaxy where a totalitarian regime, known as the Alliance, controls most of the known universe. The plot centers around the crew’s efforts to protect River Tam (Summer Glau), a young woman with telepathic abilities who has escaped from a government experiment. The story involves a dangerous secret that could jeopardize the balance of power in the galaxy, leading to high-stakes conflicts and thrilling space battles.