Serenity: Those Left Behind #1 2005 VF+

Serenity: Those Left Behind #1 is part of a three-issue miniseries that follows the crew of the spaceship Serenity, a group of smugglers and fugitives led by Captain Malcolm "Mal" Reynolds, as they try to survive on the fringes of space. The story details their ongoing struggle with the authoritarian Alliance government and introduces new threats. 

Key plot elements include: 

• A Dangerous Mission: The ragtag crew takes on a risky scavenger mission in pursuit of quick cash.
• An Old Enemy: They soon discover the mission was orchestrated by a returning adversary from their past, leading to a high-stakes standoff and firefight.
• Character Development: The miniseries explores character backstories and expands the Firefly universe, notably revealing what happened to Alliance agent Lawrence Dobson (from the Firefly pilot episode) and introducing the "Blue Gloves" operatives.
• Continuity: It explicitly sets the stage for the film, explaining the crew's circumstances and motivations immediately before the movie begins. 

The comic was written by Firefly creator Joss Whedon and Brett Matthews, with art by Will Conrad. You can find more information about the series on the official Dark Horse Comics website or other comic book retailers.