Kathryn confronts MacLaren about an affair she believes he is having, leading him to end his relationship with Carly. Charlotte, the misfire historian, is overwritten and murders her team. She attempts to assassinate Grace, but Trevor stops her. Grace reveals that the anti-Director faction was responsible for the team's abduction. Charlotte is shot by Jeff while attempting to kill Carly. Ellis reveals that he has built a quantum frame that the Director, an advanced AI, can use to travel to the present to escape the faction. David is held at gunpoint by another assassin but is saved by Marcy. The team arrives at the farm where Trevor has received a text to destroy the frame. Boyd reveals she received an order to kill MacLaren and holds him at gunpoint; Carly later reveals having been given the same mission. Assassins surround the farm as Ellis shoots Trevor to keep him from harming the frame. Grace jumps in front of Trevor and is shot as well. Ellis shuts down the perimeter shield in the hope that the Director will help them and delivers a message to destroy the frame shortly before he dies. It is revealed that the people surrounding them are not anti-Director assassins, but FBI agents led by Forbes.
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.
The first season of Travelers has a score of 100% on Rotten Tomatoes based on nine reviews with an average rating of 8.0/10. Neil Genzlinger, writing for The New York Times, described the first season as "tasty", and "enjoyable science fiction", with "some attention-grabbing flourishes and fine acting". Hanh Nguyen, writing for IndieWire, describes the series as "fun and freaky," finding the series' appeal "in how the core group of five travelers adjust to life in our present," noting the "human nature in the travelers". Lawrence Devoe, of TheaterByte.com, called the series "tautly paced and suspenseful" with "well-developed characters", declaring that "Brad Wright has a real knack for creating futuristic series". Evan Narcisse, reviewing the first five episodes for io9, appreciated the moral dilemmas offered by the series premise and the awkwardness presented by the characters' interactions with their hosts' friends, colleagues, lovers, or caretakers: "This is a superhero show in double disguise, offering up clever explorations of the secret identity concept that touch on the guilt and contortions that come with living a double life." Netflix announced that the series was one of its "most devoured" series in 2017.