Cal uses virtual reality and other unconventional therapy to help a war veteran get to the root of the cause for the severe PTSD he’s been plagued with since returning home from the Middle East.

Years earlier, Cal worked on a botched CIA case that resulted in the death of the wife and young daughter of an Irish terrorist named Doyle. Now Doyle was back in town, seeking answers and revenge. This incident leads up to Cal and Gillian meeting for the first time.

As Young and Camille attempt to resolve the hostage crisis with Kiva, Destiny suffers from power fluctuations and blackouts due to its proximity to a binary pulsar.

Against Walt’s advice, Jesse lashes out. Fearing for Jesse’s safety, Walt takes drastic action to intervene. A tragic event leads to a shocking confrontation.

Skyler gets more involved in Walt’s business, much to his chagrin. Hank struggles with his recovery. Jesse takes an active role in his new enterprise, leading him to a startling discovery.

Heads of state gather at the UN to sign the accord, three at CTU make a final effort to expose a conspiracy, Logan and Pillar tie up loose ends, and justice may elude Jack.

The Russian Federation President arrives to sign the accord, Jack wants justice, and Logan stays in pursuit. Meanwhile, Dalia has a realization, President Taylor rattles her sabers, and Chloe tests her mettle.

Walt becomes obsessed with a contaminant in the lab and refuses to finish the cook until it is eliminated. A frustrated Jesse attempts to get Walt back on track.

Britta and professor Slater fight for Jeff’s affection; Troy is upset when Abed doesn’t ask him to move into his dorm room.

Claire makes an effort to take a new family portrait, but everybody is too busy to cooperate: Gloria and Manny go with Phil and Alex to a Lakers game and share an awkward moment on the jumbotron, Cameron gets a job as a wedding singer while Mitchell takes care of Lilly and a stray pigeon, and Luke interviews Jay for a school project.