Elizabeth is pushed out of her comfort zone like never before as a major arms-control summit looms; Phillip has settled effortlessly into running the newly expanded travel agency, but an unexpected visitor makes a disturbing request.
The team attempts to keep Samaritan from destroying The Machine and sealing its hold over mankind.
Elizabeth turns her attention to an old source who could help influence the upcoming summit; Philip deals with the travel agency; Stan discovers an old acquaintance is in town.
As Paige's involvement with her parents' world deepens, tensions boil over with Matthew Beeman; Stan faces consequences at the FBI.
When the situation with Tuan takes an unforeseen turn, Philip and Elizabeth are thrown off track; Henry makes a surprising proposition; Stan encounters Frank Gaad's widow.