The team is given a mission to collect and safeguard the original power source of the Director, as it will likely be the remaining Faction members' next target. The mission is going smoothly, but the team is ambushed and killed by the Faction. With its very existence in danger, the Director initiates Protocol Alpha – and sends back a Traveler to save the team before they are killed, but the remote location, small time window, and only two host candidates within geographic range makes the probability of success low.
A suicide bomber and his victims are set to become travelers, but the bomb explodes and only Donner, the bomber, survives. Devastated by his failure, Donner tries to betray the traveler program to the authorities, but the entire hearing is populated by travelers who hold a trial and convict Donner of treason. Donner is overwritten by a new traveler, who must serve Donner's prison sentence, and reports that things in the future are getting worse despite the changes enacted by Traveler teams in the 21st. Luca approaches Donner in prison, implying that he has lost faith in the Director. Ken, David's boss, believes David's relationship with Marcy is inappropriate. Upon meeting Marcy, he believes she has defrauded the system. Marcy saves David's job by repaying her benefits. Grace, Trevor's guidance counselor, and Jacqueline, Carly's social worker, genuinely care about them, respectively. Grace tries to help Trevor with his academics, and Jacqueline promises that she will not let the system fail Carly and her child. Philip discovers that gambling outcomes are deviating slightly from the historic record.
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.