Borderlands: The Pre-Sequel!

The storyline of The Pre-Sequel focuses on Jack, an employee of the Hyperion corporation; after the company's Helios space station is captured by a military unit known as the Lost Legion, he leads a group of four Vault Hunters—all of whom were non-playable characters and bosses in previous Borderlands games—on an expedition to re-gain control of Helios, defeat the Lost Legion, and find the hidden vault on Pandora's moon Elpis. The game expands upon the engine and gameplay of Borderlands 2 and introduces new gameplay mechanics, including low-gravity environments, freeze weapons, and oxygen tanks, which are used to navigate and perform ground slamming attacks.