Dan Dare

 was a character who fought the Mekon in the British children's comic Eagle. (PROSE: Time and Relative) When Jason talked about how fictional characters were immortal, the Seventh Doctor completed his argument by noting that otherwise Dan Dare would be on his deathbed. (PROSE: Conundrum)

Behind the scenes

 * Lex Christian from the novel The Dying Days takes his name from the chaplain character that evolved into Dan Dare during development of the strip. Like the novel, the original strip was set in the
 * Andrew Skilleter named Who Dares Publishing by combining the names Doctor Who and Dan Dare with an added 's'. (REF: Blacklight)