Mark is promoted to lead a team who've had their memories surgically divided between their work and personal lives.

The team train new hire Helly on macrodata refinement. Mark takes a day off to meet with a mysterious former colleague.

Mark takes the team on a field trip, but Helly continues to rebel. A deteriorating Petey struggles to tell Mark about Lumon’s misdeeds.

Irving finds an intriguing book at work. Helly aggressively pursues a meeting with her Outie. Mark attends a funeral with Ms. Selvig.

Irving and Dylan confront Burt about his lies. Mark and Helly discover a strange new department.

The team angers Cobel by forming an alliance.

Mark and the team encounter new security measures from Cobel.

The team prepares a plan. Mark attends Devon and Ricken’s party.

The team discovers troubling revelations. Season finale.