The first and sole season of this science fiction drama focuses on several children who unwittingly assist an otherworldly entity in achieving a mysterious objective through a series of "games" in return for promised favors. The series follows Special Agent Claire Bennigan (Lily Rabe), an FBI child specialist, as she investigates events associated with kids who are communicating with an invisible force named Drill. Claire soon discovers that Drill may not be an imaginary friend of the children after all and that the mystery of her missing husband, Capt. Sean Bennigan (Milo Ventimiglia) of the U.S. Air Force, could also be connected to the strange phenomenon. Claire and Sean's son, Henry (Kyle Harrison Breitkopf), is lured into the dangerous game along with Minx (Kylie Rogers), the daughter of a high-ranking member of the Department of Defense named Wes Lawrence (Barry Sloane) who also happens to be Claire's former lover. Claire and Wes set out to discover the truth surrounding the enigmatic being known as Drill in hopes of saving their children from its influence. The cast also features Kristen Connolly as Lena Lawrence, Derek Webster as Special Agent Jessup Rollins and Catalina Denis as Dr. Maria Benavidez.