Plot

An infamous bounty hunter returns to her childhood home, the chaotic planet Pandora, and forms an unlikely alliance with a team of misfits to find the missing daughter of the most powerful man in the universe.

Lilith (Blanchett), an infamous bounty hunter with a mysterious past, reluctantly returns to her home, Pandora, the most chaotic planet in the galaxy. Her mission is to find the missing daughter of Atlas (Ramírez), the universe's most powerful S.O.B. Lilith forms an unexpected alliance with a ragtag team of misfits - Roland (Hart), a seasoned mercenary on a mission; Tiny Tina (Greenblatt), a feral preteen demolitionist; Krieg (Munteanu), Tina's musclebound protector; Tannis (Curtis), the oddball scientist who's seen it all; and Claptrap (Black), a wiseass robot. Together, these unlikely heroes must battle an alien species and dangerous bandits to uncover one of Pandora's most explosive secrets. The fate of the universe could be in their hands - but they'll be fighting for something more: each other.—Lionsgate

On the planet of Pandora, Roland, a mercenary soldier apparently gone rogue, kidnaps teenager Tiny Tina with the help of Krieg, a "Psycho" who was institutionalized in the same facility.

Meanwhile, on another planet, bounty hunter Lilith is contacted by Atlas, a powerful corporate magnate. He convinces her to rescue Tina, his daughter. Lilith returns to Pandora, her home planet, for the first time since she was a child. With the help of Claptrap, a robot that was mysteriously programmed to wait for her on Pandora, she locates Tina.

After realizing that Atlas wants his daughter back against her will, Lilith teams up with Roland and Krieg when they are attacked by the Crimson Lance, the private army of Atlas. Lilith is informed that Tina was genetically engineered with biological material from the Eridians, the ancient race that once inhabited Pandora, and that Atlas believes only she can open the Vault where the secrets of the lost civilization's advanced technology are kept.

With the help of Lilith's estranged foster mother, Dr. Patricia Tannis, they locate the key to open the Vault in an underground maze occupied by a tribe of Psychos. They manage to take the key to the surface. Lilith destroys the device Atlas entrusted her with to signal when she had rescued Tina, and he immediately communicates with her via robotic drone, explaining that he still wants the girl. Tina overhears the end of the conversation and assumes Lilith has betrayed her. She throws a grenade at Lilith, leaving her unconscious. When Lilith recovers, Claptrap unknowingly plays a holographic message for her, recorded by her mother.

The next day, without Lilith and Claptrap, the team find the Vault only to realize Atlas is waiting for them, and they fight off his men. However, Tina is unable to open the Vault. Lilith appears and explains that she is the one who can do it, being an Eridian known as the Firehawk. Atlas threatens to kill Tina if Lilith does not open the Vault. She obeys but, with Tina's help, traps Atlas inside, where a creature drags him away. The group celebrates their survival.