Based on the brilliant and popular series, The Infinite Quest sees the Doctor (voice of David Tennant) and his companion Martha (voice of Freema Agyeman) step into a new dimension -- an animated one! The pair set off on an adventure through space, following a trail of clues across wild and wonderful alien worlds, to find the location of The Infinite, a mythical spaceship that will grant the one who commands it their heart's desire. However, the evil space pirate Baltazar (voice of Anthony Stewart Head) is also searching for the ship. Confronting Baltazar with only a spoon, the Doctor tricks him into releasing a fungus that destroys his ship and frees his enslaved metal bird Caw (voice of Toby Longworth), who carries Baltazar away to prison. Many years later, as a way of saying thank you to both of them, Caw gives Martha a brooch and the Doctor a datachip, telling him that it is one of four. Collecting the remaining three will reveal the location of The Infinite, and they must hurry, as Baltazar has escaped and he has a copy of the first datachip! With spectacular animation, this vibrant cartoon is as gripping as any usual episode of Doctor Who.