 In the end, it takes the combined forces of Supergirl, the Flash, Green Arrow and the real Superman to finally separate him from the Book of Destiny and undo his changeswith the help of a special arrow that negates the Book of Destiny's abilities, though this results in his horrible disfigurement that matches his corrupted character (and thus resembles his comic book counterpart). Deegan is later seen imprisoned at Arkhamfor his crimes, with Psycho-Pirate as his next door cellmate as Batwoman tells Oliver about this . David Thewlis has been cast as John Dee in the upcoming Netflix adaptation of The Sandman.
<coherence>  In the end, it takes the combined forces of Supergirl, the Flash, Green Arrow and the real Superman to finally separate him from the Book of Destiny and undo his changeswith the help of a special arrow that negates the Book of Destiny's abilities, though this results in his horrible disfigurement that matches his corrupted character (and thus resembles his comic book counterpart). Deegan is later seen imprisoned at Arkhamfor his crimes, with Psycho-Pirate as his next door cellmate as Batwoman tells Oliver about this . David Thewlis has been cast as John Dee in the upcoming Netflix adaptation of The Sandman.
 In the end, it takes the combined forces of Supergirl, the Flash, Green Arrow and the real Superman to finally separate him from the Book of Destiny and undoing his changes, resulting in Deegan being disfigured. He is later imprisoned in Arkham . David Thewlis has been cast as John Dee in the upcoming Netflix adaptation of The Sandman.