“I remember the verything that I do not wish to;I cannot forget thethings I wish to forget.” Cicero

Peter Watts tells Catherine that Frank missed a routine homicide review with Yakima police that morning. Fearing the worst, Peter and Catherine access Frank’s computer, looking for clues that would shed light on his disappearance. The pair uncover email correspondence between Frank (using the pseudonym “David Marx”) and a Doctor Daniel Miller. Catherine tells Peter that five years ago, just before Frank collapsed, he would sometimes vanish for days at a time and check into hotels using the same pseudonym (the name of a childhood friend who passed away).

A police officer discovers Frank, his hands bandaged, at a bus station. Bletcher tells Catherine he was wearing a hospital bracelet bearing the name David Marx. When Frank returns home, he tells his wife he cannot remember what happened to him during his disappearance, but senses that someone died during his blackout period.

Watts and Frank track Dr. Daniel Miller (Danny) to a seedy hotel. Miller tells the men that Frank approached him looking for a cure to his “gift.” Miller, who keeps track of experimental drugs and clinical trials, had information pertaining to a drug called ProLoft, an antidepressant used to treat certain temporal lobe anomalies. But Frank insists he would never had expressed interest in taking such a drug for any reason.

Frank and Watts travel to a family clinic. Flashback images in Frank’s mind reveal he was incarcerated in the clinic’s trial room along with several other participants, all of whom drank from a water dispenser laced with an unknown chemical substance. The drug caused the participants to lapse into a frenzied rage, which Frank likens to “animals in the zoo.”

The drug company that ran the clinical test releases records to the Millennium Group. This allows Frank and Watts to meet with the other human guinea pigs who participated in the trial. During the discussion, Frank realizes one of the participants gouged out his own eyes, and that this same man somehow ended up dying. But he is uncertain how the death occurred. Later, Frank discovers the body of the nurse who supervised the trial in a dumpster.

Frank returns to Danny’s hotel room. There Danny tells him how, years earlier, he began experiencing hallucinations (similar to those experienced by Frank). One night Danny suddenly ran out onto a highway and was almost run over by oncoming traffic.

A researcher determines that the substance ingested by the trial participants is the exact opposite of Proloft, explaining why the participants were consumed by primal behavior. Hans Ingram, the man who ran the clinical trial, forces his way into Danny’s hotel room. A short time later, Danny runs out onto a highway and is run over by an oncoming car. Nearby, Frank finds computer print out bearing a photo of Hans Ingram.

Watts and Bletcher access Ingram’s apartment. There they discover an eyeless corpse inside a refrigerator. Meanwhile, Giebelhouse and Frank search Ingram’s office, where they find packets of a product called Smooth Time.

The Millennium Group receives word that a group of businessmen at an office complex have suddenly run amok. Frank realizes that Ingram handed out free samples of Smooth Time to study its effect. He finds Ingram surveiling the action via the office complex’s security monitors. Ingram tells Frank that the U.S. is a nation of zombies, put to sleep by his own drug company. It is his intention to “wake them up.” He is taken into custody.

Back at home, Frank tells his wife that if Jordan does possess any part of his “gift,” he will be there to guide her.