It (A Wrinkle in Time)

IT is the main antagonist of the novel A Wrinkle in Time and its 2018 film adaptation. He is an powerful entity and techno-organic being, half-machine and half-eldritch alien being and the ruler of planet Camazotz.

He was voiced by David Oyelowo, who also played Steven Jacobs in Rise of the Planet of the Apes, Agent Kallus in Star Wars: Rebels, and Scar in The Lion King.

Role in the Book
IT is an enigmatic, telepathic entity that appears as a giant human brain who dominates the planet of Camazotz and is housed in a dome near the "CENTRAL Central Intelligence" building. IT controls all the people in Camazotz and makes them often do the same things together in a mechanistic synchronism as if they were robots. Like Charles Wallace (who also has the ability to read certain peoples minds) said: they act as robots but are not. IT speaks through The Man With Red Eyes and later through Charles Wallace, and is functionally part of the interstellar cloud of evil called the Black Thing. IT's aim is to enforce absolute conformity on Camazotz, with the claimed benefit of eliminating war, unhappiness and inefficiency. However, IT is aware of cruelty, referring to itself as "The Happiest Sadist". While IT usually speaks through one of its pawns, IT can speak directly to people through telepathy, but this only happens once throughout the entire novel.

Role in the film
A techno-organic being, half-machine and half-eldritch alien being, he keeps the population of the planet Camazotz under his control with mind control that combines mind-controlling implants with his own cosmic powers. The brilliant scientist Dr. Alex (or Jack) Murry accidentally travels to Camazotz via the tesseract, at which point It make Dr. Murry into another of his slaves. Dr. Murry's daughter, Meg, uses the tesseract to rescue her father, but in the process her brother, Charles Wallace, has his mind taken over by It. In the end, Meg performs an act of true love, which destroys It and frees everyone from his control.