Pennywise

It, also known as Robert "Bob" Gray, commonly known as Pennywise the Dancing Clown or Pennywise, is the titular main antagonist of Stephen King's 1986 horror novel It and its adaptations. The character is an ancient, trans-dimensional malevolent entity who preys upon the children of the fictional town of Derry, Maine, roughly every 27 years, using a variety of supernatural powers that include the abilities to shapeshift and manipulate reality. Over the course of the story, the character primarily appears in the form of Pennywise the Dancing Clown. A group of Derry children who call themselves the "Losers Club" becomes aware of Pennywise's presence after it kills Losers Club leader Bill Denbrough's little brother, Georgie; the children then decide to hunt it down and kill it. Pennywise was portrayed by Tim Curry in the 1990 television adaptation and by Bill Skarsgård in the 2017 film adaptation, its 2019 sequel It Chapter Two and the HBO prequel series It: Welcome to Derry.