The Third Doctor is a character from the British science fiction television series Doctor Who. Portrayed by actor Jon Pertwee from 1970 to 1974, he is known for his action-oriented style and strong personality. The Third Doctor often worked with the Unit organization, dealing with extraterrestrial threats and other scientific challenges. This incarnation of the Doctor is notable for his use of gadgets and vehicles, including the iconic Bessie, a vintage car. The Third Doctor's tenure introduced a more dynamic approach to storytelling, blending adventure with elements of humor and drama, making him a memorable figure in the series' history.