Justice Riders comic; Superman's analogue is Saganowana, a bison-headed Native American hero. In Darwyn Cooke's DC: The New Frontier, Superman is one of the heroes of Earth-21, who has been active since the '40s, and still is during the events of the storyline, which occurs during the 1950s. As in Batman: The Dark Knight Returns, he is a government agent, but unlike Dark Knight Returns, he is willing to go against the U.S. government when he feels that the tensions between the humans and superhumans has to end. He is also a friend of Batman, rather than his foe as he is in Dark Knight Returns. The Kingdom Come miniseries shows an alternative future in which Kal-El went into self-imposed exile following the death of Lois Lane. He returns after ten years at the behest of Wonder Woman. This alternative Superman resides on Earth-22. He appeared in DC's mainstream continuity in the Justice Society of America story "Thy Kingdom Come", where he joined the Society in battling the being known as Gog. The Kingdom Come Superman is more powerful and less vulnerable to kryptonite than his younger mainstream counterpart, due to far greater exposure to yellow sun radiation (as explained by his Earth's Lex Luthor in the miniseries). Final Crisis #7 introduces an African-American version of the Man of Steel who is the President of the United States in his secret identity, President Calvin Ellis (with the Kryptonian name of Kalel). Writer Grant Morrison has confirmed that this Superman is a homage to President Barack Obama. This Superman appears to be multiracial with both African and European features and wears exactly the same costume as the New Earth Superman, except that his "S" insignia is yellow with a red backdrop. In Action Comics vol. 2 #9 (in The New 52) this Superman is redesigned to appear with full African features and a new costume. On Earth-23, African American heroes have risen to positions of prominence (such as Nubia being Wonder Woman) inspired by Superman's legacy. He also leads Earth-23's Justice League and originates from Vathlo Island on Krypton. He plays a big role in The Multiversity (2014-2015) and forms the Justice Incarnate, a team of superheroes from throughout the Multiverse who combat multiversal threats. In Injustice 2, he makes a cameo appearance in Green Arrow's ending working with Red Son Batman, and Flashpoint Wonder Woman to combat the threat posed