Suicide Squad favorite Harley Quinn joins DC Comics' super villains Catwoman and Poison Ivy in a movie of their own, Gotham City Sirens. Find out more in the movie and in the 2018 Gotham City Sirens Calendar that includes the last four months of 2017. It features spacious grids with room to write in all of your super-villainous exploits printed on paper certified by the Forest Stewardship Council.