Pennywise the Dancing Clown aka It is the main antagonist of It, a novel which was written by Stephen King. It is a mysterious monster which lives in the sewers under the town of Derry , Maine, and often kills children. The monster often takes the shape of a clown and calls itself Pennywise.
Add actors/actresses and cast the roles/films/series that they were rumored, considered, offered, negotiated, auditioned, turned down, and/or originally casted before getting recasted. (Please double-check in research.)