Doctor Who is a British science fiction television series that first aired in 1963 and has since become a cultural phenomenon. The show follows the adventures of a time-traveling alien known as the Doctor, who travels through time and space in a spaceship called the TARDIS. The Doctor is a complex character who is both brilliant and eccentric, and he is often accompanied by a human companion who helps him navigate the challenges of his travels. The show has been praised for its imaginative storytelling, memorable characters, and its ability to reinvent itself over the years. It has also spawned numerous spin-offs, merchandise, and a dedicated fanbase.