During preparations for the train heist, Val asks Beckett why they didn't hire someone more experienced like Bossk instead of bring along the unproven Han and Chewie. Bossk is of the reptilian race known as Trandoshans and makes his Star Wars debut in The Empire Strikes Back as one of the bounty hunters hired by Darth Vader to track down the Millennium Falcon.
He gets more screen time in Star Wars: The Clone Wars, where he acts as a mentor for the young Boba Fett and works frequently with other bounty hunters such as Aurra Sing.