Question: Which playable character on The Death and Return of Superman is an adversary to Superman, as well as the Justice League?
Context: Justice League Task Force was an American monthly comic book series published by DC Comics from June 1993 to August 1996; it lasted 37 issues.  At the time the Justice League was featured in three separate series: "Justice League America", "Justice League Europe" (JLE) and "Justice League Quarterly" (JLQ).  "Justice League Task Force" was a spinoff of "Justice League Europe", a series which ran from April 1989 to May 1993.  Like JLE, this team carried a United Nations charter which sanctioned their activities.  In fact, JLTF was composed of several former JLE members.  The team was called to action by Hannibal Martin, a representative of the U.N..  He asked that Martian Manhunter select a "strike team" of fellow Justice League members and to "lead them on a very special mission". Superman Adventures is a DC Comics comic book series featuring Superman.  It is different from other Superman titles because it is set in the continuity (and style) of "" as opposed to the regular DC Universe.  It ran for 66 issues between 1996 and 2002.  Writers on the series included Paul Dini, Mark Evanier, Devin Grayson, Scott McCloud, Mark Millar, and Ty Templeton.  It is a sister title to "The Batman Adventures" (based on "") and "Justice League Adventures" (based on "Justice League"). The Justice League is a fictional group of superheroes on the television series, "Smallville", who were adapted for television by Alfred Gough and Miles Millar.  The Justice League originally included Oliver Queen, Bart Allen, Victor Stone, and Arthur Curry; Clark Kent did not accept a role until three seasons later.  As the team continued to appear in the series, new characters were introduced and subsequently joined the team.  The original Justice League first appeared in the DC comic book "The Brave and the Bold" #28 (1960), and consisted of members Superman, Batman, Wonder Woman, Flash, Green Lantern, Aquaman, and the Martian Manhunter.  In "Smallville", the team did not make its first official appearance until the season six episode "Justice", although each member had been previously introduced individually on various episodes since season four.  In the series, the team never formalized a name for themselves, although the cast and crew officially recognized the team as the "Justice League". Superman of Earth-Two is an alternate version of the fictional superhero Superman, who appears in American comic books published by DC Comics.  The character was introduced after DC Comics created Earth-Two, a parallel world that was retroactively established as the home of characters whose adventures had been published in the Golden Age of comic books.  This allowed creators to publish Superman comic books taking place in current continuity while being able to disregard Golden Age stories, solving an incongruity, as Superman had been published as a single ongoing incarnation since inception.  The character first appeared in "Justice League of America" vol.  1 #73 (August 1969). Maxima is a fictional character from the "DC Comics" Superman titles.  She is known for searching for mates among Earth's superpowered male population; as a result, Superman becomes her obsession.  Morally ambiguous, she occasionally serves both as an adversary for Superman and a superheroine working as a member of the Justice League. The Death and Return of Superman is a side-scrolling beat 'em up video game released by Sunsoft for the Super NES and Genesis in 1994 .  It is based on "The Death of Superman" comic book storyline by DC Comics and features many characters from the comics, including Superman himself, Superboy, Steel, Cyborg, the Eradicator, and Doomsday.  All of the five Supermen are playable characters at some point. Justice League Heroes: The Flash is a side-story video game which complements the main events during "Justice League Heroes" of the PlayStation 2 and Xbox consoles.  It features Wally West / Flash as the playable character, and assistant NPC's such as Superman, Wonder Woman, Martian Manhunter, Black Canary, Green Arrow and Batman "Reign of Doomsday" is a 2011 comic book crossover storyline published by DC Comics that ran through the Superman family of books, "The Outsiders" and "The Justice League of America".  The crossover involves Doomsday hunting down Steel, Superboy, Eradicator, and Cyborg Superman, the four main characters introduced in the wake of the controversial "The Death of Superman" storyline in 1992.  Though the current iteration of the character was not present in the original "The Death of Superman" storyline, Supergirl appears in the crossover as well due to being part of the Justice League.  The storyline draws its title from "Reign of the Supermen", the immediate follow-up to "The Death of Superman". Doomsday is a fictional supervillain appearing in American comic books published by DC Comics, commonly in association with Superman.  Created by writer-artist Dan Jurgens, the character had a cameo appearance in "" #17 (November 1992) and made his first full appearance in "Superman: The Man of Steel" #18 (December 1992).  Doomsday is an adversary to Superman, as well as the Justice League. "Trinity War" is an 11-issue comic book story arc first published in 2013 by DC Comics, featuring the fictional superhero teams the Justice League, Justice League of America, and Justice League Dark.  The arc spans several titles, including: "Justice League", "Justice League of America", "Justice League Dark", "Constantine", "" and "Trinity of Sin: The Phantom Stranger".  The story is an action-mystery that sees the Justice League, Justice League of America, and Justice League Dark clash, in order to solve the mystery of Pandora's Box.  The event also introduces the Crime Syndicate and the reveal of Earth-3 to The New 52.
Answer: Doomsday