Gil Colson is a district attorney character specifically written for The Batman. He has not been in the comics, though he could be based on another character.
When Peter Sarsgaard was first cast in The Batman, there were a lot of rumors surrounding who he would play.
Peter Sarsgaard has shed some light on his character in The Batman. While the movie is shrouded in mystery, Sarsgaard has been one of more informative members of the cast.
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