During an update for historians, one of them dies from cerebral overload and is taken over by another traveler. The faction then breaks in and kidnaps the historians. A Blackbox is a device used to extract information from an unconscious or dying person and the team uses one to access a critically injured Hall to ascertain the location of historians. Jeff reaches out to his police sergeant to get his job back and is told to get help from a social worker first. Philip is questioned by the faction. Philip is given time with Kyle as a gesture of good will, who states that he sympathizes with the faction's goal, especially since he just saw another historian die during the update. Faction saves a TELL that Kyle provided to gain his support. Jeff reaches out to David to sign his therapy form for him to get his job back. David agrees to help as a social worker with Jeff's addiction, which the traveler doesn't actually have. Hall is able to relay information from when he was tracking his team's historian showing he ran into a faction team and was shot climbing a fence. He reveals that it was Kyle and Luca from his own team that shot him. Hall is able to show the team the location of the historians and the team is dispatched. While with David, Jeff receives a message to meet up at the location for tactical support. Philip is able to escape before being cornered by Kyle and Luca. Maclaren's team shows up just in time to save Philip and kills Luca and Kyle. The team saves all the historians while taking out many of the faction. Hall is told he saved them all and is able to pass away in peace knowing that. Jeff and Carly reconnect. Philip is seen throwing out his yellow pills that historians have to take.
The Faction sets off nuclear blasts that destroy all of the Travelers' archives outside the US. David, left for dead by the Faction in the last surviving archive, is the only person who can disarm the nuclear device. He succeeds but is exposed to lethal radiation. Kat's suspicions about MacLaren, temporarily allayed, surge again and she throws him out – for her the marriage is over as she feels he is no longer the man she first met. Jeff tries to escape from interrogation by 001; he is eventually found having been walled up. Marcy hopes the Director will send a Traveler medical team to save David but no help arrives. In the moment before he dies, David conveys a message from the Director: "Protocol Omega."