Guest
David Lewis as Major Gleason, a hotheaded military officer
Kyra Zagorsky as Dr. Delaney, a brilliant scientist who developed a method for collecting and storing antimatter
Garry Chalk as Detective Gower, a police detective who suspects Philip of criminal activity
Kristine Cofsky as Victoria Boyd, Traveler 3185, who assumes the life of a police officer
Giacomo Baessato as Private Wilson, a soldier who works for Gleason
Alyssa Lynch as Rene Bellamy, a high school student and Trevor's girlfriend
Tom McBeath as Ellis, Traveler 0014, a programmer who assumes the life of a farmer
Eileen Pedde as Mom, a traveler who assumes the role of a mother in a family of four
Yasmeene Ball as Charlotte, a misfire traveler historian; later a traveler assassin
Glynis Davies as Jacqueline, a representative of Child Protective Services
Melanie Papalia as Beth, an FBI analyst working for MacLaren
Karin Konoval as Bloom, Traveler 0117, a high ranking traveler engineer
Louis Ferreira as Rick Hall, a jaded traveler team leader
Douglas Chapman as Luca Shun, Traveler 2587, a member of Hall's team
Jason Gray-Stanford as Aaron Donner, Traveler 4022 (and later Traveler 4024), a bomber
William MacDonald as Gary Holden, Trevor's father
Teryl Rothery as Patricia Holden, Trevor's mother
Dylan Playfair as Kyle, a friend of Trevor, later historian Traveler 5532
Gerard Plunkett as Ted Bishop, a congressman
Matthew Kevin Anderson as Derek, Traveler D13, a traveler doctor assigned to save MacLaren
David Raynolds, introduced as foster child Aleksander (episode of the same name), returns as a guest in Season 3's "Protocol 3"
Stephen Lobo as Agent Wakefield, a faction member posing as a traveler who is later overwritten by the Director
Paloma Kwiatkowski as Abigail Paris, a young woman that Trevor befriends
Lee Majdoub as Dr. Barker, a doctor with a romantic interest in Marcy
Sunita Prasad as Blair, David's girlfriend
Melissa Roxburgh as Carrie, Travelers 5001–5007, a skydiver assigned to prevent the assassination of MacLaren's team
Amanda Tapping as Katrina Perrow, Traveler 001's psychologist, who is later taken over by 001 before the Director can overwrite him
Stephanie Bennett as Jenny, Traveler 4514, a traveler assigned to help Philip with his heroin addiction
Josh Blacker as Agent Callahan, a Traveler who assumes the life of an FBI agent
Benjamin Ratner as Ivon Teslia, a computer engineer responsible for the creation of the artificial intelligence (AI) Ilsa
Rebecca Shoichet as the voice of Ilsa, the AI hosting the Director in the 21st century
Magda Apanowicz as Dawn, a Faction traveler loyal to Traveler 001
Christopher Heyerdahl as Andrew Graeme (Traveler 7189), a mathematician whose host is discovered to be a serial killer
Veronika Hadrava as Katrina (Traveler A18), an Archivist
Karen Holness as Samantha Burns, a physicist responsible for designing the singularity engine
