The origins of the Crossing are revealed.

Mira's looming threat forges some unlikely alliances.

Clare's past is revealed. Quayle suffers through his own birthday party and drinks too much.

A new revelation puts Howard Prime and Quayle in jeopardy. Life at Echo is disrupted. Clare reconnects with her past.

Management makes a historic decision. Emily sends a warning. Quayle, Clare and Temple investigate the final Indigo cell. Howard Prime reaches out to an old contact.

Howard attempts to thwart the Guest's plans. Howard and Emily chase Kaspar.

A crisis at the O.I. leaves both Howards stranded.

Howard Prime and Emily work together to figure out Indigo's plans. Clare and Quayle consider their future. Howard must face the truth about his wife.

The aftermath of the Indigo school discovery takes an emotional toll. Quayle grapples with his wife's new identity.

Aldrich questions a not-too recent death in the office. Emily, Howard and Shaw follow a lead. Nadia attends her other's funeral and closes a deal with Clare.

Howard Silk discovers the truth about where he works. The Office of Interchange searches for an assassin.

Howard Prime, Quayle and Clare must unite against a common enemy. Emily Prime turns her investigation towards her other. Yanek probes Howard's past.

Both sides turn to diplomacy to resolve a conflict. Emily obtains a special visa. Howard interrogates a suspect.

Both Howards deepen their investigation of the conspiracy. Quayle meets one of Howard's sources. Clare must decide what to do about Baldwin.

Howard discovers another side of Emily. Howard and Emily search for answers about a mysterious drop site. Aldrich and Quayle seek intel from an old friend.

Howard is transferred to a mysterious prison called Echo. An unexpected visit gives Emily a connection to her old life. Emily Prime and Shaw's investigation is met with resistance.

The fallout of the lockdown casts suspicions around the OI. Howard and Emily Prime find clues about the history of Management. Clare questions her allegiances.

Imprisoned on the Other Side, Howard's loyalties are tested. Emily Prime gets a promotion.

Howard must work together with his counterpart. Baldwin comes face to face with her past. Emily, from the other side, tries to make sense of her orders.

While hiding in Howard’s life, Howard Prime must avoid detection at home and at the OI. Quayle and Clare struggle to adjust to their new arrangement.