In September 2017, the complete first season was made available on the FX+ online streaming service, accessible to customers of Cox On Demand, Xfinity On Demand, and the FX Now app. On October 2, the season was released on DVD and Blu-ray for Region 2, including all 8 episodes, deleted scenes, and making-of featurettes. It is set for a similar release for Region 4 on November 22.
Episode #1: "Chapter 1" - February 8, 2017
David Haller is being interrogated by government officials who believe he may be the most powerful mutant discovered. He explains that he was diagnosed as schizophrenic when he was young, and was taken to Clockworks Psychiatric Hospital after attempting to commit suicide. He spent six years as a patient there, during which time he met Sydney "Syd" Barrett, a girl who refused to be touched. She agreed to be his girlfriend, but was eventually discharged from the hospital. Before she left, Haller kissed her goodbye, causing their minds to switch bodies. Losing control, Syd unleashed abilities from Haller's body that killed his friend Lenny Busker and trapped the other patients in their rooms. Haller was evacuated in Syd's body. Later, Haller's body returned to him, and he went looking for Syd. Haller found himself being chased by two people until he was captured by the government. Now those two people, Ptonomy Wallace and Kerry Loudermilk, break into the government facility with Syd to rescue Haller and take him to Melanie Bird.
#2 "Chapter 2" - February 15, 2017
At Bird's facility Summerland, Haller begins "memory work" with Wallace, who remembers everything and can enter others' memories. Bird explains that Haller had been captured by Division 3, one of the government's divisions focused on capturing and studying mutants. Bird says that she instead wants to help Haller, by showing him that the onset of his 'illness' was just his powers manifesting. In Haller's childhood memories, he is haunted by a children's book his father read to him, The World's Angriest Boy in the World, in which the title character murders his mother. In his memories before his admission to Clockworks, Haller took drugs with Busker to try block out the voices he hears. Bird places Haller in an MRI scanner to study how his brain works, during which he accidentally projects his mind to present day Clockworks, where his sister Amy is looking for him. Amy is kidnapped by Division 3, causing Haller to panic and teleport the MRI scanner outside Summerland. Haller races to save Amy, but Barrett convinces him to wait and master his powers first.
#3 "Chapter 3" - February 22, 2017
David continues memory work with Ptonomy and Melanie, exploring his time taking drugs before his admission to Clockworks. As they watch this unfold, David is haunted by apparitions, his mind works against Ptonomy's powers, and he accidentally teleports their physical bodies to a different room. While undergoing more tests, David again loses control, projecting both his mind and Syd's to Division 3, where they find Amy being interrogated. One of her interrogators, a mutant called the Eye, sees these projections before they return to their bodies. Melanie explains that the Eye is Walter, one of the founders of Summerland, alongside her missing husband Oliver and the scientist Cary Loudermilk. Desperate for a breakthrough with David, Melanie sedates him to a point where she, Ptonomy, and Syd can enter his mind and explore freely. However, his "memories" work against them, with an embodiment of the World's Angriest Boy in the World chasing them through a version of David's childhood home, until all three are forced out of David's head.
#4 "Chapter 4" - March 1, 2017
David does not wake up from the sedative, and the others are unable to trust the "memories" that they have seen. Melanie sends Syd and Ptonomy to find David's ex-girlfriend Philly, to find out what actually happened before he was admitted to Clockworks, along with Kerry, a warrior woman who lives inside Cary, and only comes out for "action". Ptonomy enters Philly's memories, and investigates the office of David's old psychologist Poole, and learns that David's friend was a man named Benny (not a woman named Lenny), and that David attacked Poole, who now lives in a lighthouse. At the lighthouse, the trio begin discussing David with Poole, until he reveals himself to be the Eye, with the lighthouse surrounded with Division 3 soldiers. Meanwhile, David's mind is trapped in the astral plane, where he comes across a trapped Oliver. David refuses to wait for rescue with Oliver, and instead escapes himself with encouragement from an apparition of Lenny. David rescues the others from the Eye, but the latter shoots Kerry as he escapes.
#5 "Chapter 5" - March 8, 2017
Kerry is brought back to Summerland, where Cary heals her. David tells Melanie about Oliver, and demonstrates his mastery of the astral plane by creating a room where he and Syd can be together without her physical powers interfering. David soon escapes to rescue Amy, and Melanie's team arrives at Division 3 to find almost everyone murdered by David. After going over the latter's scans, Cary deduces that David's mind is infected with a parasite that he knows as the gruesome Devil with Yellow Eyes, a parasite. David takes Amy to their childhood home, where she reveals that he was adopted; Lenny appears to emerge from David's mind and explains that she has been in control of his body. Melanie's team tracks them to the house, followed by the Eye, and find Lenny attacking David. The Eye shoots at David, and Syd has him take them to their astral room. There David is helpless as the Devil with Yellow Eyes attacks Syd, until he wills their entire group to an astral fantasy; they are patients of Clockworks, under the care of Lenny.
#6 "Chapter 6" - March 15, 2017
In the shared hallucination, Lenny discusses personal issues with each of the team, such as Melanie's refusal to let go of her long missing husband, and Ptonomy having seen his mother die when he was only a child. Though most of the group are unaware of the true nature of their surroundings, Syd notices that their new reality is different from some of her memories. Lenny confronts Syd, and places her in a coma. Cary is visited by Oliver, who takes him to his home on the astral plane. Kerry goes looking for Cary, but is attacked and chased by the Eye. Oliver appears to Melanie, and leads her to the physical room where their bodies are. Time appears to them to have slowed down, with their physical bodies frozen and the bullets shot by the Eye having not yet reached Syd and David. Lenny, who is shown to be another form of the Devil with Yellow Eyes, reveals that she once knew David's biological father and specifically targeted David. She then shows her control of his mind by locking David away in a corner of his own mind.
#7 "Chapter 7" - March 22, 2017
On the astral plane, Oliver explains to Cary that he has been watching David and believes this parasite is Amahl Farouk, the Shadow King, a powerful mutant that they are both aware of. Cary explains that his physical body holds a device that may be able to isolate the parasite from David's mind temporarily. Cary wakes Syd, and sends her to help the others, while he, Oliver, and Melanie attempt to affect the physical world by getting the device to David. Farouk as Lenny attacks Syd, Kerry, and the Eye, killing the latter (his physical body dies as well). David figures out that Farouk and his father were both powerful mutants who had fought some time ago, with Farouk losing. His father then put David up for adoption to protect him from Farouk, but the latter was able to find David and infect his mind since he was young. With the device locking Farouk away in David's mind, he returns to his physical body and catches the bullets. The group then return to Summerland, but are attacked there by Division 3 soldiers. Farouk begins to break free.
#8 "Chapter 8" - March 29, 2017
During David's initial breakout from Division 3, his interrogator was severely burned and struggled to recover. When he was able to walk, the interrogator, Clark, insisted on returning to field work immediately. He now leads the Division 3 soldiers to Summerland where David uses his powers to easily subdue them. Taking Clark hostage, David tries to reason with him while his superiors watch through a camera in a prosthetic eye. With Farouk gaining strength, Cary and Oliver attempt to extract the former from David, while Farouk uses David's mind to talk to Syd. Warning her that David will not survive this process, Syd decides to kiss David, transferring Farouk to her own body. Farouk then leaves Syd, entering Kerry's body and using her to fight off the others until being confronted by David. David sends Farouk out of Kerry, but unknowingly into Oliver's body. Farouk escapes Summerland in Oliver's body, while Clark agrees to work with the mutants to stop him. Later, David is miniaturized and trapped by a drone-like device.
The Legion series was renewed for a 2nd season!