Ted Marcoux

Cleo breaks a vial of AIDS-tainted blood, which pierces her skin. Carter gives Chen a good peer review and applies for a job elsewhere. Kovac submits Abby's application to reenter medical school without informing her. A rampaging gunman kills and injures over one dozen children and adults. Greene realizes the killer is Derek Fossen, the father of the little boy Greene had placed in protective custody. The vengeful Fossen killed his son's foster caretakers and shot a cab driver en route to his next destination--Greene's house. But police wound Fossen and bring him to County General. Greene transports Fossen to surgery. Alone with the conscious but restrained mass murderer in an elevator, Greene purposely allows him to go into cardiac arrest and die.

Jack finds Kyle Singer's residence, but Kyle, unknowingly in possession of the deadly virus, is gone. Meanwhile, as President Palmer prepares himself for the upcoming televised debate, Wayne forces him to consider some serious allegations against Anne which have surfaced; and a technical specialist (guest star Andrea Thompson) is brought in by CTU to play a critical role in dealing with the viral threat.

A tragedy reunites Claire with a guy who sullied her reputation at school; David and his new boyfriend run into Keith and his new partner on the disco circuit; and Ruth has an eye-opening camping trip with Hiram.

President Palmer must make a life-threatening decision regarding Jack. Meanwhile, Kim learns of her father's drug addiction; and Ryan Chappelle takes command of CTU.

Russell and Sipowicz track down a man who attacks women after they use ATM machines. The squad’s gay male receptionist asks Simone for help after he and his lover are attacked. Sipowicz tells Simone that Russell has a drinking problem.