Joker is a standalone movie within the DC Universe.
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However, the latest trailer might reveal a Batman v Superman connection.
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The poster for Excalibur can be seen in the Joker trailer...
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It also appeared in Batman v Superman...
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And in both, it was at the theater, which is where Thomas Wayne dies in BvS.
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It might just be a simple Batman v Superman Easter egg...
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...But it could mean there's a bigger link between the two films to be revealed.
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