In this task, you will be shown an extract from a movie plot and a question. You need to provide the correct answer for it. Short answers containing words that are present in the passage are preferred.

Dr. Carter Nix (John Lithgow) is a respected child psychologist. His wife, Jenny (Lolita Davidovich), becomes concerned that Carter is obsessively studying their daughter, Amy; he regards her like a scientist tracking the development of his creation. But Carter himself suffers from multiple personality disorder consisting of Cain, a street hustler, Josh, a shy 10-year-old boy, and Margo, a middle-aged nanny. Carter and Cain are killing young mothers to procure their children for his experiments.Jenny is having an affair with Jack Dante (Steven Bauer), the widower of a former patient. She had a relationship with him years ago, but he left her. Now she plans to leave Carter and elope with him. When Carter accidentally discovers their tryst, he descends completely into his madness and begins leaving subtle clues for the police that Jack is the real killer. Next, he attempts to kill Jenny by submerging her car in a lake. She escapes and confronts Carter at home. Unable to find Amy, Jenny demands Carter tell her where she is. Carter replies that she is with his father, whom Jenny knows has been dead for years.Carter is apprehended for attempted murder. The police bring Dr. Lynn Waldheim (Frances Sternhagen) to interrogate him. Waldheim interviews Carter and informs the police that she co-wrote a book with Nix Sr. called Raising Cain, about a boy with multiple personality disorder. Nix Sr. had extensive detailed knowledge of Cain's tortured childhood, including taped recordings of their sessions. However, Waldheim was never allowed to meet Cain. She pieced the situation together: Nix Sr. dispassionately put his own son through years of severe child abuse to gain firsthand accounts of his traumatic psychological development and study the emerging personalities. Horrified, Waldheim quit the project.During interrogation, Margo and Josh act and speak for Carter. Josh recites a rhyme and vanishes, and Margo assumes control. She stonewalls Waldheim from any further questioning. Eventually, Carter and Cain break from their confines. They pounce upon Dr. Waldheim, knocking her unconscious and leaving the building disguised as her. The police soon find Waldheim begging them to arrest Carter before any children are harmed.Nix Sr. (Lithgow) is in fact alive, having faked his own death to elude prosecution for attempting to buy babies. He has established a new identity and a clandestine research facility in Norway. He has been using Carter and his multiples to procure the children so he will have an adequate control group to study the development of MPD. Jenny follows who she thinks is Waldheim to a motel, but it is actually Carter/Cain. She follows Carter/Cain, who is now Margo, into an elevator. When it opens, she sees Nix Sr. with her daughter Amy. While Jenny begs for Nix Sr. to give back her daughter, Carter, Cain and Margo stabs "their" father from behind. Jack arrives with the police, and Carter and his personalities disappear.The movie ends with Jenny and Amy in a park. Amy runs off into the woods calling "Daddy, Daddy". Jenny follows her and finds Amy, who says her father has gone away. When Jenny bends down to pick Amy up, Carter appears behind her in a wig and a dress; Margo is now in control. Jenny holds Amy in her arms, oblivious to who is behind her., Question: What does he need the children for?
Answer: Study the development of MPD.

Federal Communications Commission (FCC) investigators arrive in the San Fernando Valley after what appears to be a flying saucer crash, causing massive interference with tele-radio transmissions. During their investigation, they receive eyewitness reports of what appears to be a man dressed in a bizarre outfit, which appears to be radioactive and thus a public threat.Their investigation uncovers this man is actually a humanoid creature from outer space, who is invisible without his suit. They start a massive manhunt for the radioactive invisible alien running loose.The action culminates in Los Angeles where the invisible alien has been tracked. He becomes trapped inside the famous Griffith Observatory. The woman lab assistant discovers that he can be seen using ultraviolet light. The alien attempts to communicate by tapping out a code, but no one can understand the code. Now breathing heavily because his breathing gas reserves are running low, he is trapped high-up on the Griffith telescope's upper platform. Because he can no longer survive without his breathing gas, he falters and then falls to his death. His body briefly becomes visible before completely evaporating, Question: who attempts to communicate by tapping out a code, but no one can understand the code?
Answer: the alien

A priest invites Professor Howard Birack and his students to join him in the basement of an abandoned Los Angeles church. He requires their assistance in investigating a mysterious cylinder containing a swirling green liquid. Among those present is Brian Marsh, a student in theoretical physics.They decipher the text found next to the cylinder which describes the liquid as the corporeal embodiment of Satan. The liquid appears sentient, and broadcasts increasingly complex streams of data. The academics use a computer to analyze the data, and find that it includes differential equations. Over a period of two days, small jets of liquid escape from the cylinder. Members of the group exposed to the liquid become possessed by the entity, which uses them against the others. Attempts to escape from the building are thwarted by a mass of possessed street people who surround it and barricade the doors from the outside. Two members of the research group are killed.Birack and the priest theorize that Satan is actually the offspring of an even more powerful force of evil, the "Anti-God", who is bound to the realm of anti-matter. The survivors find themselves sharing a recurring dream (apparently a tachyon transmission sent as a warning from the future year "one-nine-nine-nine") showing a shadowy figure emerging from the front of the church. The hazy transmission changes slightly with each occurrence of the dream, revealing progressively more detail. The narration of the transmission each time instructs the dreamer that they are witnessing an actual broadcast from the future, and they must prevent this possible outcome.Eventually, the cylinder opens and the remaining liquid is absorbed into the body of student Kelly, who transforms into the physical vessel of Satan: a gruesomely disfigured being, with powers of telekinesis and regeneration. Satan attempts to summon the Anti-God through a dimensional portal using a mirror, but the mirror is too small and the effort fails.While the rest of the team is occupied fighting the possessed, Kelly finds a larger wall mirror and draws the Anti-God's hand through it. Brian's lover and fellow physicist, Catherine Danforth, is the only one free to act: she tackles Kelly, causing both of them to fall through the portal. The priest shatters the mirror, trapping Kelly, the Anti-God, and Catherine in the other realm. Catherine is seen briefly on the other side of the mirror reaching out to the portal before it closes. Immediately, the possessed die, the street people wander away, and the survivors (Brian, Birack, The Priest, and Walter) are rescued.Brian has the recurring dream again, except that now Catherine, apparently possessed, is the figure emerging from the church. Brian awakens and finds Catherine, gruesomely disfigured, lying in bed with him. This is still part of his dream, however, and he awakens screaming. Rising, he approaches his bedroom mirror, hand outstretched., Question: What is the liquid in the cylinder?

Answer: Satan