Three months after the events with the Quantum Frame, Mac and Kat are working through their issues during her first trimester. Marcy has moved out of David's apartment and has taken a job as an X-ray technician at a local hospital. Philip has traded one addiction for another, but is in denial about it. Trevor is growing concerned with the lack of communication from the Director. The discovery of a murdered Traveler team puts Mac on the trail of Vincent. 

It's not a special-effects-heavy show. Instead, it focuses on squeezing every drop of juice out of the slightly off-kilter premise. For a start, "taking over" present-day human hosts kills them. So there's a massive built-in moral dilemma. And it's worked out with painstaking logic. Time travelers try to pick people who were about to die anyway - but this too presents problems. The time travelers need to remain undiscovered, which means seamlessly picking up the threads of their hosts' lives. Time travelers may have motivations of their own, which need to be dealt with in the present. It all meshes beautifully.
After asking Marcy to move out, David admits he cannot bear to be without her. She tells him she is dying, and they kiss. Trevor tries to connect with his father. Jeff files assault charges, preventing Carly from finding a job. She asks him to take the baby for an afternoon, unaware he has tipped Kat off to Carly's relationship with MacLaren. Under orders, a traveler murders her host's Cabinet-member husband, and instructs MacLaren to board a flight as Congressman Bishop's seatmate. In flight, MacLaren learns he is to activate a stasis field to save himself and Bishop, while all others aboard will die in a crash. MacLaren discovers Kat followed him on board, believing she would witness his infidelity. He instructs Kat and Bishop to use the stasis device, and attempts to survive impact unaided, using only Philip's knowledge of the crash. At the crash site, the team resuscitate Kat and Bishop, and Bishop is overwritten. To Carly's dismay, MacLaren is taken away by traveler paramedics before the team can reach him.
Travelers transfer into a cult preparing for mass suicide. MacLaren's team, the cult, and many other travelers, including senior engineer Bloom, meet at the antimatter facility. Bloom reveals that the future has been subtly rewritten and is not as united as it once was. Dosed with antitoxin, they release a toxic cloud to force a local evacuation. Gleason interrogates Delaney until MacLaren returns her to the facility and explains the nature of travelers. Gleason discovers Delaney's escape and prepares to return to her lab. Using the antimatter to power an x-ray laser, the travelers intend to deflect asteroid Helios 685, saving millions of lives and preventing the environmental catastrophes and devastating wars that led to their dark future. Deflecting Helios has been the Director's main goal, even though it could possibly prevent the travelers' own births in the future. Gleason leads an assault, killing most of the cult travelers and Bloom before she can fire the laser. However, travelers transfer into his soldiers and eventually into him, sacrificing themselves to complete the mission. The traveler within Gleason fires the laser while MacLaren and his team save Delaney from the antimatter explosion on Bloom's orders. MacLaren is unsure of the mission's success, as his team remains in the present.
Hundreds of years from now, the last surviving humans discover the means of sending consciousness back through time, directly into people in the 21st century. These Travelers assume the lives of seemingly random people, while secretly working as teams to perform missions in order to save humanity from a terrible future. These travelers are: FBI Special Agent Grant MacLaren, the team's leader; Marcy, a young, intellectually disabled woman in the care of her social worker, David; Trevor, a high school quarterback; Carly, a single mom in an abusive relationship; and Philip, a heroin-addicted college student. Armed only with their knowledge of history and an archive of social media profiles, the travelers discover that 21st century lives and relationships are as much a challenge as their high-stakes missions. Written by ahmetkozan
After asking Marcy to move out, David admits he cannot bear to be without her. She tells him she is dying, and they kiss. Trevor tries to connect with his father. Jeff files assault charges, preventing Carly from finding a job. She asks him to take the baby for an afternoon, unaware he has tipped Kat off to Carly's relationship with MacLaren. Under orders, a traveler murders her host's Cabinet-member husband, and instructs MacLaren to board a flight as Congressman Bishop's seatmate. In flight, MacLaren learns he is to activate a stasis field to save himself and Bishop, while all others aboard will die in a crash. MacLaren discovers Kat followed him on board, believing she would witness his infidelity. He instructs Kat and Bishop to use the stasis device, and attempts to survive impact unaided, using only Philip's knowledge of the crash. At the crash site, the team resuscitate Kat and Bishop, and Bishop is overwritten. To Carly's dismay, MacLaren is taken away by traveler paramedics before the team can reach him. 

Carly loses custody of her son until the trial. Grace is due to die, so Trevor kidnaps her to save her life. Believing he is insane, she flees and is overwritten despite having avoided the accident that would have killed her. Grace and another newly arrived traveler, Ellis, are computer programmers who have fled an anti-Director faction in the future. Ellis has developed a code that is sought by this faction, and has returned to the 21st century to keep it from them. David and Marcy consummate their relationship. However, her condition worsens and Boyd stabilizes her, but Marcy is near death. In the future, Grace was in charge of social media research and identifying the candidates. She wants to correct Marcy's condition with an experimental overwrite. She offers to redirect Marcy's original transfer into the functional part of her brain, saving her at the cost of her 21st-century memories. MacLaren lets Marcy decide, and she decides to speak to David first. However, her condition becomes critical shortly before David returns home, and she is overwritten by her earlier self. Her team introduces her to David.
Retrieved from Fornander Collection of Hawaiian Antiquities and Folk-lore, Vol. IV, Ea Mai Hawaiinuiakea speaks of the genealogy of our Hawaiian Islands and our royalty beginning with Haloa, the first man of Hawaii. Genealogy chants are important in Hawaii because they’re a reflection of one’s background. Identity allows one to better understand their kuleana (responsibility) to their place and people because they understand that they have a role to play in the continuing of this genealogy, this story of Hawaii.
The team learns that Traveler 001 is still alive in the body of his former psychologist, Perrow, when the Faction tries to capture him/her. Perrow dies but they believe 001 had access to a transfer device (since in the future he helped construct one) and as a result they are unsure where his consciousness now resides. Doubts about their loved ones worsen for Kat (suffering hallucinations and suspicions), Jeff (now, not Jeff and trying to make amends) and David, who is concussed.
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