It was here that John Constantine first appeared, making a non-speaking cameo in Saga Of The Swamp Thing #25 before showing up one year later in Saga Of The Swamp Thing #37, offering information on the plant-creature’s true origins in exchange for help in fighting various mystic threats.
Though he is more famous today for writing V For Vendetta and Watchmen, Moore first found critical fame for his work on the comic series Saga Of The Swamp Thing.
Constantine made his grand return to the Arrowverse in the Legends of Tomorrow mid-season premiere episode ‘Daddy Darhkest‘.
The first Easter Egg came early in the episode, shortly after John explained the situation to Sara and was offered a bit of help from The Legends.