GamesRadar.com / 12.12.25

Frankenstein director Guillermo del Toro's scrapped DC movie would have been led by John Constantine and included a Batman cameo

Justice League Dark would have focused on the supernatural side of DC
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Other sources

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  IGN.com 12.12.25

  Guillermo del Toro Reveals Scrapped Justice League Dark Plans That Included a Batman Cameo