The origins of the Crossing are revealed.

Mira's looming threat forges some unlikely alliances.

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 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.

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

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

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.

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

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.

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