The guys at the firehouse make Pete believe that Marty has a thing for him. Pete, Berg and Sharon decide to hang out at O'Malley's, their old college hangout, just like old times since Johnny is having his bachelor party but Johnny shows up anyway and Berg gets mad at him for ruining their evening and punches Johnny right in the face.

The guys at the firehouse find Pete's make-up bag and the fire chief asks Pete to give his daughter a makeover. In hopes of getting off probation at the hospital Berg lends his apartment to his superior so she can take a nap but she has an affair instead. Sharon has a tea party and Pete and Berg's invites members of the hospital but the wrong ones show up first and they think that she's running a prostitution ring.

Sharon gets jealous when Johnny helps his friend Shawn with her Lamaze class, Pete is mad at Berg when he goes out with Marti because Pete wanted to go out with her and Germ suspects Ashley of stealing hospital supplies.

Sharon and Johnny get joint checking accounts but Sharon makes all the important choices, Pete is stressed when Marti gets into fireman boot camp before he does and they admit to each other that they like each other, Berg is depressed so he visits his parents only to discover that his mom threw his dad out because he cheated on her.

Irene throws Sharon and Johnny a wedding on the roof after Sharon cancels some of the plans, Pete and Marti go off to fireman boot camp and Berg and Irene hook-up.

Berg and Irene race to bury any proof of their fling, while Johnny gives Sharon a post-wedding shock and Pete realizes that, for a firefighter, Marti is a cold, cold girlfriend.

Boston turns against Ashley after Pete leaks her link to Nomar's rumored exit from the Red Sox; Berg begs Johnny to keep his secret fling with Irene under wraps when Sharon comes sniffing for the scoop.

In a dialogue-free show, a pregnant woman stalks Ash, a mystery lady stuns Pete and Johnny spoils Berg's shower time. Meanwhile (and also silently), Sharon seeks the stray dog who swallowed her wedding ring.