from_fictional_universe jonny double
Marvin Arthur " Marv " Wolfman ( born May 13 , 1946 ) is an American comic book writer . He is best known for lengthy runs on Marvel Comics ' s " The Tomb of Dracula ", for which he and artist Gene Colan created the vampire - slayer Blade , and DC Comics ' s " The New Teen Titans " and the " Crisis on Infinite Earths " limited series with George Pérez . The ___MASK56___ ( DCU ) is the fictional shared universe where the stories in most American comic book titles published by DC Comics take place . DC superheroes such as Batman , Superman , and Wonder Woman are from this universe , and it also contains well known supervillains such as the Joker , Lex Luthor , and Darkseid . It should be noted that in context , " ___MASK56___ " usually refers to the main DC continuity . DC Comics , Inc . is an American comic book publisher . It is the publishing unit of DC Entertainment , a subsidiary of Warner Bros . Entertainment , Inc . , a division of Time Warner . DC Comics is one of the largest , oldest , and most successful companies operating in American comic books , and produces material featuring numerous well - known heroic characters , including Superman , Batman , Wonder Woman , Green Lantern , Supergirl , The Flash , Aquaman , Cyborg , Shazam , Martian Manhunter , Zatanna , Static Shock , Hawkman , Hawkgirl and Green Arrow . The fictional ___MASK56___ also features teams such as the Justice League , the Justice Society of America , the Suicide Squad , and the Teen Titans , and well - known villains such as Joker , Lex Luthor , Darkseid , Catwoman , Ra ' s al Ghul , Deathstroke , Professor Zoom , Sinestro , Black Adam and Brainiac . The company has also published non - ___MASK56___ - related material , including " Watchmen ", " V for Vendetta " and many titles under their alternative imprint Vertigo . " Crisis on Infinite Earths " is an American comic book crossover storyline published by DC Comics from 1985 to 1986 , consisting of an eponymous 12 - issue , limited series comic book and a number of tie - in books . It was produced by DC Comics to herald a simplification of its then 50 - year - old narrative continuity . The series was written by Marv Wolfman and illustrated by George Pérez ( pencils and layouts ), Mike DeCarlo , Dick Giordano and Jerry Ordway ( inking and embellishing ). The series removed the multiverse concept from the fictional ___MASK56___ , depicting the death of long - standing characters Supergirl and the Barry Allen incarnation of the Flash . Continuity in the ___MASK56___ is divided into pre - Crisis and post - Crisis periods . Ra ' s al Ghul (" Ras al - l "; " Ghoul ' s Head " or " Demon ' s Head "; pronounced or ) is a fictional supervillain appearing in American comic books published by DC Comics , commonly as an adversary of the superhero Batman . Created by editor Julius Schwartz , writer Dennis O ' Neil and artist Neal Adams , the character first appeared in " Batman " # 232 ' s " Daughter of the Demon " ( June 1971 ). The character is one of Batman ' s most enduring enemies and belongs to the collective of adversaries that make up Batman ' s rogues gallery . Given Ra ' s al Ghul ' s high status as a supervillain , he also comes into conflict with other superheroes in the ___MASK56___ . The Tomb of Dracula is a horror comic book series published by Marvel Comics from April 1972 to August 1979 . The 70 - issue series featured a group of vampire hunters who fought Count Dracula and other supernatural menaces . On rare occasions , Dracula would work with these vampire hunters against a common threat or battle other supernatural threats on his own , but more often than not , he was the antagonist rather than protagonist . In addition to his supernatural battles in this series , Marvel ' s Dracula often served as a supervillain to other characters in the ___MASK23___ , battling the likes of Blade , Spider - Man , Werewolf by Night , the X - Men , and the licensed Robert E . Howard character Solomon Kane . The Swamp Thing is a fictional character in the ___MASK56___ He is a humanoid / plant elemental creature , created by writer Len Wein and artist Berni Wrightson . Swamp Thing has had several humanoid or monster incarnations in various different storylines . He first appeared in " House of Secrets " # 92 ( July 1971 ) in a stand - alone horror story set in the early 20th century . The character then returned in a solo series , set in the contemporary world and in the general DC continuity . The character is a swamp monster that resembles a humanoid mass of vegetable matter . He fights to protect his swamp home , the environment in general , and humanity from various supernatural or terrorist threats . Jonathan Sebastian `` Jonny '' Double is a fictional character in the DC Comics universe . Created by Len Wein and Marv Wolfman , he first appeared in Showcase # 78 ( November 1968 ) . Len Wein ( born June 12 , 1948 ) is an American comic book writer and editor best known for co - creating DC Comics ' Swamp Thing and Marvel Comics ' Wolverine , and for helping revive the Marvel superhero team the X - Men ( including the co - creation of Nightcrawler , Storm , and Colossus ). Additionally , he was the editor for writer Alan Moore and illustrator Dave Gibbons ' influential DC miniseries " Watchmen ".