Some time later, Caw takes the Doctor and Martha to his home planet, where he gives Martha a brooch as a gift. He also spits up a datachip, explaining that it and three others like it hold the location of "The Infinite", an ancient spaceship that can grant people their heart's desire. Each datachip leads to the next one. At first unwilling to search for it and about to destroy the chip, the Doctor is forced to when Caw notes that Baltazar has a copy of the datachip. As the two set off on their quest, Caw is revealed to be working for Baltazar.