It is a 1990 ABC two-part psychological horror drama miniseries directed by Tommy Lee Wallace and adapted by Lawrence D. Cohen from Stephen King's 1986 novel of the same name. The story revolves around a predatory monster that can transform itself into its prey's worst fears to devour them, allowing it to exploit the phobias of its victims. It mostly takes the humanoid form of Pennywise, a demonic clown. The protagonists are The Lucky Seven, or The Losers Club, a group of outcast kids who discover Pennywise and vow to kill him by any means necessary. The series takes place over two different time periods, the first when the Losers first confront Pennywise as children in 1960, and the second when they return as adults in 1990 to defeat him a second time after he resurfaces.

It is a 1986 horror novel by American author Stephen King. It was his 22nd book and the 17th novel written under his own name. The story follows the experiences of seven children as they are terrorized by an evil entity that exploits the fears of its victims to disguise itself while hunting its prey. "It" primarily appears in the form of Pennywise the Dancing Clown to attract its preferred prey of young children.