John Deegan

John Deegan is the main antagonist of the Arrow/The Flash/Supergirl Crossover Elseworlds. 
He is a former worker at the Arkham Asylum who is Given the Book of Destiny by the Monitor. Deegan uses the book to rewrite the Arrowverse in Earth-1. In truth, the deeper meaning for this event is the Monitor's test to see if this Earth is capable of defeating the Anti-Monitor. 
Deegan was later defeated by Oliver Queen, Barry Allen, Kara Danvers and their allies. 
John Deegan is based on John Dee/Doctor Destiny from DC Comics.
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