Lifeline is a fictional character from the G.I. Joe: A Real American Hero cartoon series. He is the G.I. Joe Team's rescue trooper and debuted in 1986.
His real name is Edwin C. Steen, and his rank is that of sergeant E-5. Lifeline was born in Seattle, Washington.
Lifeline's primary military specialty is medic. Lifeline worked as a paramedic with the Seattle Fire Department for five years, before discovering that EMS personnel were not eligible for pensions if they became disabled while giving aid off-duty. Since he figured rescue personnel were never off-duty, he decided to make his status permanent by enlisting in the army as a corpsman. Lifeline is also an avowed pacifist; he's a black belt in 'aikido', the art of directing violent energy away from oneself.
Lifeline appeared in the original G.I. Joe animated series. He first appeared in the animated series in the second season episode "Arise, Serpentor, Arise!: Part I". He is voiced by Stan Wojno Jr.
Lifeline plays a major role in the episode "Million Dollar Medic", where he befriends Brittany "Bree" Van Mark after saving her and her father Owen Van Mark when their yacht gets caught in a crossfire between G.I. Joe and Cobra. After befriending Bree, Lifeline develops a relationship with her and also protects her when Cobra threatens Owen to relinquish his factory to them.
G.I. Joe: The Movie
Lifeline also appeared briefly in the 1987 animated film G.I. Joe the Movie.