"Borderlands" begins some time after the Dahl Corporation's abandonment of the planet Pandora. Four Vault Hunters (Brick, Lilith, Mordecai, and Roland) arrive in search of the fabled Vault. After discovering the town of Fyrestone, the Vault Hunters begin to receive psychic instructions from a mysterious woman known as the "Guardian Angel". The Vault Hunters meet a CL4P-TP or "Claptrap" robot and a doctor named Zed who help them establish a reputation by killing several bandit leaders, eventually leading to the collection of an alien artifact, being the first piece of a key needed to open the Vault. This causes Patricia Tannis, Dahl's former archaeologist still in residence on the planet, to contact the Vault Hunters, revealing that the Vault can only be accessed once every 200 years and that the time of the next opening is approaching. Tannis also explains that three more artifacts are needed to complete the Vault Key. Meanwhile, Commandant Steele of the Crimson Lance (a well-outfitted military force led by the Atlas Corporation) threatens to declare martial law and demands the Vault Key pieces.