Mary deals with harassment from a boy she turned down for a date; Lucy's new best friend seems to be hiding something; Simon prepares Ruthie for pre-kindergarten.

Annie is livid when her father brings along his girlfriend on a weeklong visit; Mary and Matt pursue new romantic interests; Lucy wants to find out if blondes really have more fun.

Mary undergoes knee surgery, while Matt learns that Michael Towner was the hit-and-run driver; Wilson reveals the truth about Billy to Eric.

Simon wants to buy the perfect gift for Deena because its their three month anniversary, but it ends up consuming his time which annoys his friend, Nigel, who's visiting. Rod (Lucy's ex-boyfriend) is spending time at the Camden's home because his mother died and doesn't want to face his father as he's angry with him. Heather is back in town, and she tells Matt that she's engaged. Meanwhile, Dr. Hasting's---the doctor who almost killed Matt when he was born, works at Glen Oak Hospital and Annie is not thrilled, especially with the possibility that he may deliver her twin babies. Mary tells everyone that she's back with Wilson, but it's not true. She made it up to get attention from guys. Lastly, Michael Towner, who hitted Mary with his car two years ago calls her.

Two parishioners entreat Eric to take their suffering dog to the vet to be put down. Matt catches Mary in a lip-lock with Michael Towner in a most unlikely place. When caught, Mary gets into a big fight with Matt because he's always intruding in her life. After a night of cooling off and a talk with Sgt. Michael's and each other (Matt and Mary), things go back to normal. Simon and Lucy double date together with birthday girl Deena and her older brother who is visiting. The dates are a success.