The Tenth Doctor and Martha Jones set off on an adventure through space to find the datachips to unlock The Infinite, a huge spaceship that can grant people their heart's desire. However, the evil Baltazar is also searching for the ship.

During a visit to a local diner the doctor stumbles upon a mysterious alien artefact that leads him on a mission to rescue Rivesh Mantilax from the threat of the Viperox and the clutches of the American military in New Mexico.