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| WrittenBy = 더퍼 형제
| OriginalAirDate = {{Start date|2016|7|15}}
| ShortSummary = 친구내친구네 집에서 자신의 집으로 돌아가전 중 윌은 무언가 이상한 것을 보게 된고, 윌이 있는 곳에서 가까운 정부의 비밀 실험실에서는 끔찍한 일이 벌어진다.
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| WrittenBy = 더퍼 형제
| OriginalAirDate = {{Start date|2016|7|15}}
| ShortSummary = 루카스와 마이크, 더스틴은 숲속에서 한 소녀를 만나고, 호퍼는 조이스에게서 이상한 전화 통화에 대한 이야기를 전해 듣는다.
| ShortSummary = The boys bring Eleven to Mike's house, where she sleeps in the basement. The next day, Mike nicknames her "El". She says that "bad people" are looking for her and refuses to meet Mike's parents. Scientists from the laboratory find a substance oozing from the walls of Joyce's home. At Mike's home, Eleven recognizes and points out Will in a photo. Dustin and Lucas want to inform Mike's parents about Eleven, but she uses [[psychokinesis]] to stop them. While searching for Will, Mr. Clarke, the boys' science teacher, discovers a scrap of a hospital gown outside the laboratory grounds. Nancy goes with her friend Barb to a party at her boyfriend Steve's house. Will's brother Jonathan investigates the woods where Will went missing. Hearing screaming, he runs to help but finds only Steve, Nancy, and their friends roughhousing around Steve's swimming pool. He secretly photographs them. Barb, left alone by the poolside, vanishes. Joyce receives another call from Will, hears music from his room, and sees something coming through the wall.
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| WrittenBy = 제시카 멕렌버그
| OriginalAirDate = {{Start date|2016|7|15}}
| ShortSummary = 바버라가 걱정된 낸시는 혼자 바버라의 행방을 알아보려다 조나단 역시 그녀와 비슷한 상황임을 알게 되고, 조이스는 윌과 접촉할 방법을 강구한다.
| ShortSummary = Barb wakes up in an empty and decaying pool. She screams for Nancy and attempts to climb out but is dragged down by something unseen. Joyce strings [[Christmas lights]] around her home to talk to Will, who can turn them on and off. Hopper views security camera footage from the lab and realizes it is fake. He and his deputies research Hawkins Lab, its director Dr. Martin Brenner, and a woman named Terry Ives who claimed her daughter was taken by Brenner. Eleven has a flashback in which Brenner, whom she calls "Papa", has her put in [[solitary confinement]] for refusing to telekinetically harm a cat. Nancy worries about Barb, who is missing. Steve and his friends discover Jonathan's photographs. They destroy them and his camera. Nancy recovers a photo of Barb by the poolside and returns to Steve's house to search for her. Nancy finds Barb's car and sees the creature in the woods. Joyce establishes a code with Will using the lights, which he uses to tell her that he is alive but unsafe. He tells Joyce to run as a creature begins to climb through her wall. Will's apparent body is discovered in the water at a quarry.
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| WrittenBy = 저스틴 도블
| OriginalAirDate = {{Start date|2016|7|15}}
| ShortSummary = 윌의 죽음을 인정할 수 없는 조이스는 윌을 찾는 것을 포기하지 않는다. 소년들은 일레븐을 보통 소녀처럼 꾸며 위장하고, 낸시와 조나단은 서로 힘을 합친다.
| ShortSummary = Eleven proves to the boys that Will is still alive by making contact through Mike's [[walkie-talkie]]. Joyce goes to the morgue to view the body and refuses to believe it is Will. The boys give Eleven a makeover so they can sneak her into school. Joyce hears Will in her living room wall. Tearing away the wallpaper, she sees him behind a membrane. At school, Eleven uses Mr. Clarke's [[ham radio]] to channel Will talking to his mother. Joyce demolishes the wall with an axe but reveals only her front porch. Nancy discovers a figure behind Barb in Jonathan's photo. Jonathan realizes that the figure matches his mother's description of the creature: a humanoid figure with long arms and no face. Nancy tells the police about her missing friend and subsequently admits to her mother that she slept with Steve. When she tells Steve about the police, she is irritated that he cares only about not getting in trouble with his father. Hopper confronts the state trooper who found Will's body and beats him until he admits he did not find the body. Hopper goes to the morgue and finds that Will's supposed body is a dummy. He breaks in to Hawkins laboratory.
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| WrittenBy = 앨리슨 태트록
| OriginalAirDate = {{Start date|2016|7|15}}
| ShortSummary = 낸시와 조나단이 윌을 데려간 존재와 대면하는 동안 호퍼는 정부의 비밀 실험실에 잠입한다. 소년들은 클락 선생에게 다른 차원으로 여행하는 방법을 물어본다.
| ShortSummary = Will's father Lonnie assures Joyce that her experiences are hallucinations. The boys conclude that Will is trapped in an alternative dimension which Eleven calls the Upside Down. Hopper discovers a portal in the basement of the lab but is knocked out by the lab's guards. He wakes at home and finds a hidden microphone. After Will's funeral, the boys ask Mr. Clarke about other dimensions. He tells them that a high-energy [[spacetime]] tear could create a passage between dimensions. The deputies inform Hopper that Barb's car was found by the state; Hopper finds the state's involvement suspicious. Positing that a tear in spacetime would disrupt Earth's [[electromagnetic field]], the boys follow their compasses. Eleven remembers being placed in a [[Isolation tank|sensory-deprivation tank]] to telepathically eavesdrop on a man speaking Russian; while listening, she came across the creature. Scared of encountering the creature again, Eleven redirects the compasses. Lucas notices the distortion and confronts her. Mike defends her, he and Lucas fight, and Eleven telekinetically flings Lucas off Mike. While Dustin and Mike tend to the unconscious Lucas, Eleven disappears. In the woods, Nancy and Jonathan find a wounded deer. The creature drags the deer away, and Nancy and Jonathan follow the trail of blood. Nancy crawls through a passage to the Upside Down and discovers the creature feasting upon the deer. She steps on a root, drawing the creature's attention.
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| WrittenBy = 제시 닉슨로페즈
| OriginalAirDate = {{Start date|2016|7|15}}
| ShortSummary = 낸시가 사라지자 조나단은 그녀를 찾으려 애쓰고, 스티브 또한 낸시를 애타게 찾는다. 호퍼와 조이스는 정부의 비밀 실험에 대한 진실에 다가선다.
| ShortSummary = When she can't get out of the portal by herself, Jonathan pulls Nancy through and saves her from the creature. In her bedroom, she is afraid to be alone and asks Jonathan to stay. Steve sees them together through her bedroom window and assumes they are dating. The next day, Nancy and Jonathan resolve to kill the monster and purchase supplies from an [[surplus store|army surplus store]]. During a fist fight with Steve, Jonathan inadvertently assaults a police officer and is arrested. Joyce and Hopper track down Terry Ives, who is comatose and tended by her sister Becky. Becky explains that Terry underwent [[Project MKUltra]] testing while unknowingly pregnant; she believed her daughter Jane was kidnapped by Brenner at birth. Joyce and Hopper conclude Eleven is likely Jane. Eleven shoplifts [[Eggo waffle]]s. She recalls being asked to contact the monster and how her contact opened the portal to the Upside Down in the laboratory basement. While searching for Eleven, Mike and Dustin are ambushed by bullies Troy and James. Troy holds Dustin at knifepoint and demands that Mike make a suicidal jump into the lake where Will's body was discovered. Mike jumps but is levitated to safety by Eleven, who dispatches the bullies. Lucas sees agents leaving the laboratory and realizes they are heading to Mike's house.
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| WrittenBy = 저스틴 도블
| OriginalAirDate = {{Start date|2016|7|15}}
| ShortSummary = 일레븐은 윌과 접촉하려 애쓰고, 루카스는 "나쁜 사람들"이 오고 있음을 알아차린다. 낸시와 조나단은 경찰에게 조나단의 카메라에 찍힌 사진을 보여준다.
| ShortSummary = Lucas warns Mike via walkie-talkie that government agents are en route. Mike, Dustin, and Eleven flee the house. Eleven telekinetically flips a van that blocks their path, and the kids escape. Lucas reconciles with Mike and Eleven. Joyce and Hopper are called to the police station, where they find Nancy and Jonathan. Jonathan reveals his knowledge about the creature to his mother and Hopper. The group contacts Mike and his friends and they rendezvous. They ask Eleven to search for Will and Barb, but she is too weak to find them. To amplify Eleven's powers, they break into the middle school and build a sensory-deprivation tank. Eleven finds Barb's corpse with a slug-like creature crawling out of her mouth. With Joyce's help, she finds Will alive, hiding in the Upside Down "Castle Byers", his backyard fort. Hopper and Joyce break into Hawkins Laboratory but are apprehended by security guards. Nancy and Jonathan resolve to kill the monster and steal their hunting gear back from the police station. In the Upside Down, the monster breaks into the fort where Will is hiding.
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| WrittenBy = 폴 디처<br>더퍼 형제
| OriginalAirDate = {{Start date|2016|7|15}}
| ShortSummary = 브레너 박사는 호퍼와 조이스를 감금해 심문하고, 소년들은 일레븐과 함께 학교 체육관에 숨는다. 낸시와 조나단은 윌을 데려간 존재에 맞서 싸울 계획을 세운다.
| ShortSummary = Hopper gives up Eleven's location to Brenner in exchange for access to the portal. He and Joyce enter the Upside Down. Hopper recalls his daughter Sarah struggling to breathe before her cancer diagnosis. Nancy and Jonathan booby-trap the Byers' home, then cut their hands to attract the creature with their blood. Steve arrives, intending to apologize to Jonathan about their fight. The monster attacks but disappears before springing the trap. Steve gets in his car to leave but returns to fight the monster. The monster springs the trap but escapes back to the Upside Down. Eleven and the boys hide in the middle school. Mike asks Eleven to a school dance called the Snow Ball and kisses her. The military storms the school. Eleven kills them and collapses. As Brenner cradles her, the monster attacks. The boys carry Eleven to a classroom and hide. Hopper and Joyce find the monster's nest in the Upside-Down town library. Will is there, unconscious with a tendril down his throat. At the middle school, the monster finds the children. Eleven pins it against a wall, and she and the monster vanish. Hopper and Joyce perform CPR on Will and revive him. Will is hospitalized and reunited with his mother, brother, and friends. Hopper is reluctantly picked up by a black car. One month later, Nancy has gotten back together with Steve, and both are friends with Jonathan. Hopper leaves Eggo waffles and other food in a box in the woods. Will coughs up a slug-like creature and has a vision of the world as the Upside Down, but he hides this from his family.
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