Legion

David Haller is diagnosed as a paranoid schizophrenic and locked up in a mental institute. However, he soon realizes that he may be far more than human after he falls in love with another patient.

When the mutants take David to Summerland, Ptonomy helps David unravel his past to learn what he is capable of. Meanwhile, The Eye captures Amy.

When Ptonomy is unable to break through the barriers in David's memories, Melanie orders him to speed up the procedure. Meanwhlie, Brubaker tells Amy what her brother really is.

While David meets an apparent ally in the astral plane, Ptonomy, Kerry, and Syd try to track down the source of David's memories and learn which are real and which are not.

David finds a way for him and Syd to touch, and then goes off to rescue Amy on his own. Meanwhile, Cary realizes what the Devil is.

David and the others find themselves at Clockworks, but only one of the them believes that something is wrong. Meanwhile, the Devil tells David what's really going on.

David consults with himself to find a way out of the trap that the Devil has set with him. Meanwhile, Cary joins forces with Oliver, and Syd finds Kerry.

The team prepares to extract the Shadow King from David's mind. Meanwhile, D3 has plans of its own, and Oliver remembers Melanie.

David returns to consciousness after being trapped in the sphere, and discovers that a year has passed for everyone else while only minutes passed for him. Summerland is working with Division 3 to fight the greater threat of Ahmad Farouk, aka the Shadow King. However, Division 3 believes that Farouk still has a hold on David... and they may be right.

After helping Farouk, Lenny, and Oliver break into Division 3, David demands a face-to-face meeting with the Shadow King. Meanwhile, Kerry steps in and Cary steps out, and Lenny asks Farouk for a favor.

One of the Monks' victims escapes confinement, infecting the rest of Division 3 with the neural disorder. As David struggles to rescue his friends, he gets a strange series of message from Future-Syd.

To get Syd out of the maze of her endlessly-repeated past, David must figure out why she's there.

Clark, Ptonomy, and David question Lenny about where she's been and why she's back... and how she exists in a physical body.

After learning that Amy is dead, David decides what reality to live in

Farouk tells David to take what he wants, and David and Syd come to an arrangement about David's interactions with her future self. Meanwhile, Ptonomy spreads insanity throughout Division 3.

David sets out to stop Farouk from finding his body, and comes to a crossroad of possibilities where he sees his future death.

Oliver communicates with Melanie, while Kerry and Cary carry out David's plan. Meanwhile, Lenny receives an unexpected visitor.

Melanie tells Syd the truth about David, while David tortures Oliver for information as to Syd's whereabouts.

After David defeats Farouk, the true face of the enemy reveals itself.

David gains an ally in the battle against his former friends: a time traveler who can undo anything that happens to him. Farouk meets the traveler and discovers just how powerful she is.

The Forces of Division try to use Squirrel to lead them to David, but Lenny captures Cary and David "convinces" his prisoner to help expand Jia-yi's abilities.

David has Switch takes him back to his infancy to try and stop Farouk from entering his mind, and sees how his parents met.

Time demons enter real time through a gap created by Switch's powers. As the demons eat time, David meets his mother; Syd share a drink with her teenage self; Farouk, Clark, and Kerry battle the demons in their nest; Cary rescues Switch; and Lenny meets her future daughter.

After defeating a squad of Division 3 and stripping Daniel of his memories, David locates the airship with some help from Farouk and takes the fight to his enemy to recover Switch.

In a distant land, Melanie and Oliver take in a baby Syd while Jerome Wolf watches and follows them into the city as Syd grows up. In the end, there's only one way to settle things: a rap battle between Oliver and Jerome.

David tries to help Charles defeat Farouk in the past, while Syd takes another path to stopping Baby David before he becomes the adult who abused her.

David and Charles join forces against the younger and older Farouks, and Charles makes a deal. Meanwhile, Switch meets her father and makes amends for what she has done.