: Widely considered one of the best expansions in the series, it dives into Claptrap’s psyche to retrieve the "H-Source," further exploring the origins of Jack’s hatred for the robot.
The Pre-Sequel serves as a critical bridge in the Borderlands timeline, exploring the moral erosion of . Initially presented as a man with "good intentions" attempting to save Pandora's moon, Elpis, Jack's journey is one of increasing paranoia and entitled megalomania.
: Through missions like "Handsome AI," players witness Jack's desire for immortality by digitizing his personality—a process that results in an AI declaring all humans must die.