An FBI agent specializing in child psychology, Claire is introduced to Drill through Harper's case. From there, she becomes the most determined member of the investigation of and defence against whatever Drill is. Her son, Henry, is one of Drill's friends, and her husband, Sean, has been missing since a bizarre incident for the Air Force.
Volunteered for an Air Force mission when he found out about Claire and Wes' affair, and disappeared over Russia.
Another FBI agent working against Drill, his daughter Minx has been playing with Drill.
Wes' wife and Minx' mother. Their marriage has been strained since his affair.
Claire's partner in the FBI.
Dr. Maria Benavidez
After being kidnapped by an amnesiac patient, Dr. Benavidez becomes the team's medical advisor.
"Where I'm from, when people are rounded up-"
"This isn't like that."
- The Kirk: Not a major character, but makes executive decisions between emotional and utilitarian advisors.
Secretary of Defense Frommer
- The Spock: Between Wes and Winters, is the most ruthless.
A strange man who has been keeping tabs on families Drill has been in contact with
- Children Are Special: Drill can't talk to anyone who has "changed" - presumably, gone through puberty.
- From the Mouths of Babes: Nearly everything we know about Drill has been translated through their eyes.
- Infant Immortality: Not as a rule.
- Innocence Lost: Unfortunately, undergoing this trauma will have a profound impact on all the children involved.
Drill's first playmate we meet. As part of their game, she drops her mother out of a treehouse, putting her in a coma.
- Treehouse of Fun: No.
Wes and Lena's daughter, Minx has had a hard enough time watching her parents fight, even before Drill came to play. She made the deal that, if she won the game, her parents would love each other again.
Claire and Sean's son. In exchange for playing with Drill, he wanted his dad to come home.
- Littlest Cancer Patient: ... until Drill gives him back his hearing, after a fever Deafened him.