The First Doctor is a mysterious character and little is known about him at the outset except that he has a granddaughter, Susan Foreman, and that they come from another time and place. He has a ship that travels through time and space, the TARDIS, which is currently disguised as a police box (Susan notes that it used to be able to change to blend in with its surroundings), and is bigger on the inside. The Doctor describes himself and Susan as "exiles" without specifying why or even whether their exile is self-imposed. It would not be until the last adventure of the Doctor's second incarnation that the name of the Doctor's people (the Time Lords) would be revealed, and the third incarnation before the name of his home planet (Gallifrey) was first spoken.