André is a 29-year-old assistant professor of history from the Netherlands. He focuses on "experimental" history by learning medieval dress and customs rather than simply reading about them. He serves as second-in-command at the Dordogne archaeological site. He possesses practical skills in jousting and swordplay that prove essential when exploring the past.

Katherine is a young history graduate student from Colorado with a background in architecture. She uses her extensive climbing experience to map high places on the archaeological site. She acts courageously and applies a highly pragmatic approach to dangerous situations.

Christopher is a 24-year-old graduate student in history at Yale writing his dissertation on medieval mills. He experiences caution and frequent stomach trouble in the modern world. He regularly struggles with disastrous romantic relationships that distract him from his academic pursuits.

Professor Johnston is a Regius Professor of History at Yale and the leader of the Dordogne archaeological dig. He possesses extensive knowledge of the fourteenth century and easily blends into historical settings. He maintains a sardonic manner while proving savvy enough to handle corporate pressure from his financial backers.

David is the project technologist on the Dordogne archeological dig. Thin and bespectacled, he possesses deep knowledge of physics. He maintains a healthy skepticism regarding the safety claims made by ITC and chooses to remain in the present to monitor the equipment.

Robert is the 38-year-old CEO of ITC. He is a physicist and entrepreneur focused on commercializing advanced quantum technology. He exhibits a volatile temper and routinely ignores safety concerns to protect his company's proprietary secrets.

Lord Oliver is an English knight who controls Castelgard and La Roque in 1357. Known as the Butcher of Crécy, he is an unpleasant and famously bad-tempered leader who suffers from intense paranoia regarding military threats to his territory.

Arnaut is a mercenary commander known as The Archpriest. Crafty and ambitious, he challenges Lord Oliver's control over the lucrative market towns and mills in the region.

John is the senior vice president of ITC and a former Air Force project manager. Smart and curious, his job is to make his CEO's ambitious technical visions a functional reality.

Diane is the attorney for ITC. She holds a close professional history with the company's leadership. She actively works to protect the corporation's interests from outside scrutiny and legal threats.

Sir Robert is a formidable knight in the service of Lord Oliver in 1357. He acts as an aggressive enforcer for his lord. He relentlessly pursues intruders across the medieval countryside.

Sir Guy is a knight serving under Lord Oliver. Often dressed in black, he is aggressive and violent. He fiercely protects his honor and actively pursues his desired marital prospects to increase his wealth.

Lady Claire is the young aristocratic ward of Lord Oliver in 1357. Fiercely independent, she uses her intelligence to survive the dangerous political maneuvers of the powerful men around her.

Sophie is an aristocratic young woman living near the archaeological site in 1999. She enjoys the attention of the university students but is fickle in her affections.

Victor is a security officer for ITC and a former Marine. Pragmatic and aware of the physical dangers associated with the company's projects, he insists on carrying modern weaponry during expeditions.

Susan is a company guide for ITC assigned to escort the academic team on their expedition into the past.

Elsie is the graphologist on the Dordogne archaeological dig. She works diligently to decipher and translate ancient manuscripts recovered from the site.

Joseph is a materials physicist at ITC whose sudden illness in the Arizona desert sets the initial investigation in motion.

Dan is a tourist driving through the Arizona desert who stops to investigate a strange wanderer on the roadside.

Liz is an architect traveling through Arizona with her husband. She insists on rendering aid when they encounter a sick man in the desert.

James is a policeman in Gallup who investigates the mysterious circumstances surrounding an ITC employee's death.

Father Grogan is a local priest in Gallup who provides early historical context regarding the diagrams found in the desert.

Dr. Tsosie is a physician at the McKinley Trauma Unit who attempts to treat the bizarre symptoms of her desert patient.

Sir Raimondo is a handsome knight fighting under Arnaut De Cervole. He initially appears as a dashing exemplar of chivalry but harbors a deeply ruthless streak.

The Abbot is a religious leader at the Monastery of Sainte-Mère in 1357. He opposes Lord Oliver's taxation of the mill and aligns his monastery with opposing mercenary forces.

Sir Daniel is the uncle to Lady Claire. He worries heavily about his niece's safety and the dangerous political marriage proposed for her.