Steven S. DeKnight has stepped down as showrunner on Netflix's upcoming superhero series Jupiter's Legacy due to "creative differences" with the streaming service, which has already begun looking for his replacement. Jupiter's Legacy is based on a graphic novel by Mark Millar and illustrator Frank Quitely. The series follows the world’s first generation of superheroes, who received their powers in the 1930s. Now in present day, they are the revered old guard, but their super-powered children struggle to live up to the legendary feats of their parents. [caption id="attachment_719371" align="alignright" width="250"] Image …