Serenity: Those Left Behind is a 2005 three-issue comic book limited series published by Dark Horse Comics. It was written by Brett Matthews with Joss Whedon credited for story, illustrated by Will Conrad, and colored by Laura Martin. It is the first comic book series to be based on Whedon's short-lived 2002 television series Firefly and the 2005 feature film into which it was adapted, Serenity. The story is set between the end of the series and the beginning of the film, and its plot includes the depiction of what happened to Lawrence Dobson, the Alliance covert operative who attempted to capture Simon and River Tam in the pilot episode of Firefly, also titled "Serenity". Source: Wikipedia (en)