Captain Jack Harkness

Captain Jack Harkness is a fictional character from the British TV series "Doctor Who" and its spin-off "Torchwood." He is a charismatic, centuries-old former soldier and con man who becomes a hero involved in battling extraterrestrial threats. Known for his courage, wit, and moral complexity, Jack is distinctive for being temporarily immortal—unable to die—due to advanced alien technology. His character explores themes of time, morality, and human resilience, making him a compelling blend of action hero and moral enigma within science fiction storytelling.