Matt's new girlfriend seems more interested in hanging out with his family than with him; Simon thinks he can make himself invisible; Lucy wants to join the cheerleading squad.

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.

One of the members of Eric's congregation, Mrs. Bink persuades him to investigate the real reason of why her best friend Mrs. Hinkle is moving into a retirement home. Meanwhile, Simon and Ruthie are performing an experiment and are trying to convince Matt that Simon is shrinking, but the tables suddenly turn for Simon. Also, Lucy tries to get to the bottom of one of her classmates, Shelby as she is rumored all over school of being bulimic.

Eric is trying to cheer up a woman whose son died three years ago. She wants to meet the people who received her son's organs after he died. Mary got her driver's permit, but not everyone is enthusiastic to ride with her. Meanwhile, Lucy and Simon decide to take the bus. A freshman has a crush on Lucy and sits beside her, which makes his girlfriend jealous and angry with Lucy. Simon gets into some trouble with this tough guy who wants help with his homework. Also, a pregnant girl steals Matt's car and leaves Matt with her broken car, which happens to be stolen. She is running away from home because her parent's don't forgive her for getting pregnant.

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.

Mary and her friend Corey Conway learn that they have been named recipients of their senior classes ""All Sports Award"" and they are both thrilled. Although, the local businessmen revoke the honor from Corey when they learn Corey is a mother. Angered and hurt by their actions, Mary gives her reward to Corey in front of the entire assembly. On the home front, tensions build after Eric and Annie find a bag of marijuana in Simon's new friend's backpack. They confront his family (who at first deny there is an issue), but after a successful intervention with the police, the boy's father agrees to seek counseling and to find a job. Meanwhile, Matt faces a disciplinary action after he breaks the honor code during a school exam. Also, Lucy questions herself whether she should help a boy she likes to access the school's computer system when she's working in the attendance office.

In order to get extra credit, Simon volunteers to paint a holiday mural with a few good guys in his school. The other volunteers don't like Simon because they are inhaling paint fumes and are afraid he will report them. When one of the boys winds up in the hospital, Simon is accused of providing the paint. After he confronts the boy, the boy decides to confess everything to his parents. Meanwhile, Mary is suddenly thrilled about her community service after she meets the man of her dreams: Robbie Palmer. Eric and Annie are hesitant to allow Mary to pursue a relationship because of her punishment, but do allow Robbie to call her. Matt is up in arms when he learns that Shana is transferring to NYU and that his father provided a reference without his knowledge, and Ruthie wins first prize in her art-school project: a sculpture of the Camden family noses.

Responsibilities fly out the window when Eric and Annie enjoy seperate nights out on Friday. Although the reverend can't find anyone to hang out with him, so he calls a bewildered Matt. Annie is conferring with a professor (guest-star Jeff Yagher). Mary strays even further away from her parent's image of her when she is tempted to drink and smoke one night after work. Also, Mary makes friends with married co-workers Frankie and Johnny (guest-stars Chyler Leigh, Nathan West) with questionable morals while working the late shift. Matt blows Simon's chance at a big date with an older woman (guest-star Katie Stuart) when Matt is distracted by a close encounter of the female kind and forgets to pick up Simon. Also, Lucy gets a taste of the not-so-glamorous side of parenting when her and a classmate take care of an egg.

A month has passed since Eric invited Mary's ex-boyfriend to stay with the Camden's until he got on his feet. Robbie happily continues to act as a member of the household--- and it's driving Annie crazy. Robbie is Eric's latest 'project', Ruthie's new best friend, recipient of Simon's financial advice, and according to Mary, Lucy's boyfriend. He's even cooking and folding laundry (the wrong way!). Frustrated and emotionally strained, Annie starts to think nobody needs a mother anymore. Also, Matt also feels unneeded from the family due to Robbie and pays an unexpected visit to Heather and her new boyfriend.

Eric arranges for Peter and his dog to visit a drug rehab center to cheer up the patients. Peter bonds with Nick and helps him reconnect with his estranged son. Lucy finds out that Kevin has been secretly coaching the Glenoak Police Department husband-and-wife softball team and demands that she be allowed to play. Just before his first date with Paris, Chandler receives a letter from Roxanne telling him she still loves him. Martin confronts Cecilia about her lingering feelings for Simon, prompting Ceclia to call Simon to let him know she has a new boyfriend. She is also surprised when he admits that he is also dating someone and Ruthie is jealous of Cecilia and Annie's close relationship.

A distraught Peter learns that his alcoholic and mean-spirited father who abandoned his family three years ago, has changed his ways and wants to be part of Peter's life again. In the wake of this monumental news, Chandler must decide how this will impact his relationship with Paris and Peter. Meanwhile, Ruthie feels that Peter is pushing her away during this chaotic time and Reverend Camden finds a philanthropic way for the community and his family to embrace Vic.

Lucy finds her husband Kevin and his partner Roxanne in a compromising position while on an undercover police assignment, Cecilia and Martin's relationship hits another bump in the road when their after-school commitments get in the way of one-on-one time, and Chandler may have bitten off more than he can chew as a new parent. Ruthie and Peter get stranded after missing their bus during a school field trip. However, fate intervenes when the youngsters cross paths with Lost Boys Nicodemus and Jacob, who not only take care of them until Reverend Camden arrives, but also share the heartbreaking story of their struggle to stay alive.

When Kevin leads Venus (guest-star Martha Plimpton), a young woman, to believe that Martin is a rookie cop, she quickly expresses interest in him. Martin's friend Mac (guest-star Kyle Searles) encourages him to pursue Venus. Martin has a hard time revealing the truth after he learns that Venus' father is serving in the Middle East. Meanwhile, Eric and Annie are worried that Martin is getting in over his head with Venus and enlist Kevin to fix things, which only leads to rumors around the police station that Kevin is cheating on Lucy.

Mac also jumps in by spreading rumors about Martin at school. Lastly, Ben (guest-star Geoff Stults) continues to hide his relationship with Lucy's new baby doctor, even though they spend a weekend together.