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For the farseeing meter , Batmanbelieved he did n’t have any siblings and that he was an only child . However , the ' Joker ' filmthrew a bend in Bruce Wayne ’s fib , as that adaptation of the Clown Prince of Crime is possibly Thomas Wayne ’s bastard son . However , Batman ’s literal brother on Earth-3 might be just as twist ( if not worse ) than the Joker .
In ' Joker ' , starring Joaquin Phoenix and take aim by Todd Phillips , it ’s heavily propose that Arthur Fleck might be the boy of the billionaire Thomas Wayne . Fleck ’s female parent Penny was a former employee at Wayne Enterprises and write letter of the alphabet to Thomas about their affair ( he denied it ) . The revelation is left for the most part open - ended , but the implication Joker is the older brother of Bruce adds another dimension to the character ’s family relationship . But , in the comics , the real Thomas Wayne Jr. was a deplorable supervillain as well .
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In the comics , there subsist two prominent versions of Thomas Wayne Jr. The first one is the older comrade from Earth-3 who becomes part of the Crime Syndicate as Owlman . That interpretation of Wayne Jr. is a psychopath , as he helped Alfred shoot down Bruce and his parent on that Earth - albeit the Wayne ’s were monsters themselves . Owlman and the Crime Syndicate have prove to operate and put down Batman ’s Earth ( and the universe ) on multiple occasions assisting bothDarkseidandLady Perpetuain their attempts to take down Earth - Prime .
Thomas Wayne Jr. also look in Scott Snyder and Greg Capullo’sCourt of Owlsarc . Lincoln March runs March Ventures and pretends to be an ally of Bruce . In reality , March was work alongside the Court of Owls . March later exact that he is the real Wayne Jr. and say that he was civilize by the Court of Owl ’s to replace Batman - however , he leaves the radical after he ’s killed and brought back to liveliness by them . In their last do in the spark , Wayne Jr. is seemingly pour down in an plosion , but considering he was given a healing factor from the Court , he ’s practically immortal . Like Arthur Fleck in ' Joker ' , the comic does n’t really confirm whether March is telling the truth . He could be Bruce Wayne ’s real brother , or he could be make the intact tale up as a ploy against him .
Regardless of the potential Thomas Wayne Jr. ’s calf love with owls , Batman’sbrother on both Earth-3 and Earth - Prime both turn out to be tough guys that come after Bruce . After fighting with Owlman , Lincoln March , and Joker , it ’s dependable to say Bruce Wayne is beaming he was an only child .
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