Daniel Jackson, Ph.D., is a fictional character in the military science fiction franchise "Stargate", and one of the main characters of the series "Stargate SG-1." He is portrayed by James Spader in the 1994 film "Stargate", and by Michael Shanks in "Stargate SG-1" and other "SG-1" derived media. Jackson is the only "Stargate" character to appear in all of the films and series in the franchise (not including the non-canonical "Stargate Infinity"); the main character Jack O'Neill did not appear in the 2008 film "".