10 episodesFirst aired 10 December 2017
Howard Silk (J.K. Simmons) is a lowly cog in the bureaucratic machinery of a Berlin-based United Nations spy agency. When Howard discovers that his organization safeguards the secret of a crossing into a parallel dimension, he is thrust into a shadow world of intrigue, danger, and double cross… where the only man he can trust is his near-identical counterpart from this parallel world.
E1Dec 201756m
Howard Silk discovers the truth about where he works. The Office of Interchange searches for an assassin.
E2Jan 201857m
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.
E3Feb 201856m
Both sides turn to diplomacy to resolve a conflict. Emily obtains a special visa. Howard interrogates a suspect.
E4Feb 201856m
Both Howards deepen their investigation of the conspiracy. Quayle meets one of Howard's sources. Clare must decide what to do about Baldwin.
E5Feb 201854m
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.
E6Feb 201855m
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.
E7Mar 201852m
Clare's past is revealed. Quayle suffers through his own birthday party and drinks too much.
E8Mar 201855m
The aftermath of the Indigo school discovery takes an emotional toll. Quayle grapples with his wife's new identity.
E9Mar 201852m
Howard attempts to thwart the Guest's plans. Howard and Emily chase Kaspar.
E10Apr 201855m
A crisis at the O.I. leaves both Howards stranded.