Unlike the 1987 TV series, the 2003 series more closely matches the tone of the original comics, with a greater emphasis on action and themes of familial bonds. As a result, the 2003 series is more adult-oriented, while still being considered appropriate for younger audiences. The series adapts a large scope of story arcs from the comics, with the Turtles' adventures combining elements of both fantasy and science fiction. They also fight the Foot Clan led by Shredder as well as the Purple Dragons led by Hun and the mad scientist Baxter Stockman. Later seasons have the Turtles contending with Agent John Bishop of the Earth Protection Force. By the end of the third season, the Shredder is revealed to be an Utrom criminal named Ch'rell. Upon his defeat at the hands of the Turtles, Ch'rell is exiled to the ice asteroid Mor Gal Tal.