Brigadier Lethbridge-Stewart is a fictional character from the British science fiction television series Doctor Who. He first appeared in the 1968 episode "The Web of Fear" and became a recurring character, known for his leadership in the United Nations Intelligence Taskforce (UNIT), an organization that deals with extraterrestrial threats. Lethbridge-Stewart is portrayed as a brave and resourceful military officer, often collaborating with the Doctor, particularly the Third Doctor, played by Jon Pertwee. His character is notable for his iconic bowler hat and his dedication to protecting Earth from alien invasions.