(warning Doctor Who fans, SPOILERS!) Formerly Captain Jack Harkness, he was a companion of the Doctor (Doctor Who). After a long battle with the Daleks on Satellite Five, he was killed and then brought back to life by another companion, Rose Tyler. Since then, he could not die. He lived a long, and (relatively) happy life, until he died saving New New York on New Earth.
Captain Jack Harkness: I remember when people used to call me "The Face of Boe"