Serenity is a 2005 science fiction space western/epic film written and directed by Joss Whedon. It is set in the universe of the cancelled FOX science fiction television series Firefly, taking place approximately two months after the events of the final episode.In the film, Mal says that Simon and River have been on the ship for 8 months. In the Firefly episode "Trash", Mal says that he first encountered Saffron "bout a half year back".

"Serenity" was the original two-hour series pilot for the Firefly science-fiction television series created by Joss Whedon. However, FOX executives were not satisfied with this as a pilot, and so instead, "The Train Job" was created to be the pilot. "Serenity" was not aired until the end of the series's run.

Serenity is a fictional spaceship originally featured in the science fiction television series Firefly. It has also appeared in the comic book series and the film Serenity.

Serenity is a manga-influenced comic series created by Realbuzz Studios and published by Barbour Publishing in 2005 and 2006. It incorporates strong Christian morals, such as forgiveness, responsibility, and unconditional love as it follows title character Serenity Harper through her experiences with a local prayer group. The series, along with the phrase "Oops, can't show that in a Christian manga!" (which comes from a censor box found in the comic itself), has become a minor meme on 4chan.

The soundtrack to the 2005 motion picture Serenity was released on September 27, 2005. The film's score was composed by David Newman, and performed by the Hollywood Studio Symphony under Newman's direction. According to director Joss Whedon's sleeve notes for the album, Newman was recommended by Universal's music executives when he requested a musician capable of "everything."