The core traveler team is a team of five Travelers who serve as the protagonists of Travelers. The team is led by Grant MacLaren (3468), with other members Carly Shannon (3465, a tactician), Marcy Warton (3569, a medic), Philip Pearson (3326, a historian) and Trevor Holden (0115, an engineer). David Mailer, a non-Traveler, was considered an honorary team member for his heroism in preventing the bombing of the fourth archive site (David). In the episode Helios-685 the original five are seen reciting what appears to be an oath:

"We, the last unbroken remnants, vow to undo the errors of our ascendants, to make the Earth whole, the lost unlost, at peril of our own birth."
The team was first assembled in the year 2016 during Version One of the Traveler program. Marcy was the first to arrive in the past, followed by Trevor, Philip, Carly, and finally MacLaren a day after the others.