The Doctor is a fictional character from the British television series Doctor Who. The Doctor is a Time Lord, an alien species from the planet Gallifrey, who travels through time and space in the TARDIS, a time machine that looks like a blue British police box. The character is known for their intelligence, resourcefulness, and a strong moral compass, often helping those in need. The Doctor has the ability to regenerate, allowing them to take on a new appearance and personality when near death. This unique trait has enabled multiple actors to portray the character over the years, each bringing their own interpretation to the role. The Doctor often travels with companions, who assist in adventures and provide a human perspective.