Warning! SPOILERS for Batwoman season 3, episode 7
The Batwoman season 3 mid-season finale confirmed that Swamp Thing exists on Earth-Prime following Crisis on Infinite Earths. The Guardian of the Green was previously established as being a part of the Arrowverse, with the events of his short-lived series on the DC Universe streaming service being established as having taken place on Earth-19 of the Post-Crisis Arrowverse. However, this marks the first confirmation of Swamp Thing existing on the
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