Joey is assigned to protect an abortion clinic that has received bomb threats; Christa blackmails Paul.
Mary wants to continue with her pregnancy even though she can't forgive Turk for his affair; Joey befriends an old man who Turk remembers as being a murderer.
Mary moves in with Mike and Erin; Keefer takes Ginny hostage; Paul cheats on Carolyn with her father's attorney.
Mike confronts his inner demons when he and Cliff are trapped inside a bank during an armed robbery; Mary confronts Joe about his affair.
Mary finds out that she's pregnant and is informed by Keefer that Joe has been unfaithful; Mike is haunted by nightmares of being injured on the force.
Mike identifies a suspect in the murder of a girl at a video arcade; Joey and Teri try to call a truce in their relationship; Joe and Mary see a counselor.
Turk tries to help stay the execution of an inmate on death row; Mike recuperates from his surgery and worries about Donny Jr.
The Turks endure an agonizing wait as Mike undergoes emergency surgery after being shot in the line of duty.
Joey has to find an ear that was chewed off in a barroom brawl; Erin and Mike argue over whether to have Donny live with them; Mary agrees to marriage counseling.
When Mike learns about his father's affair, he confronts him; Joey and his new partner Leigh tail a suspect; Paul loses his job delivering pizza.
Joe has difficulty relating to Mary when he takes her out to dinner; Mike and Cliff track a teen valet who allows cars to be stolen.
Joey risks his career and reputation to protect his brother; Mike is forced to kill a drug dealer in a hostage situation gone bad.
In Chicago, a veteran police officer and his close-knit family face day-to-day struggles. This episode: Joey confronts Paul about a gun; Joe and Mary grow apart.