The streets of Glenoak are alive with the sound of music as the Camden family breaks into song for a very special Valentine's Day musical episode. Classic songs (""Love Is Sweeping the Country,"" ""You Were Meant For Me,"" ""Nice Work If You Can Get It,"" among others) are performed by the Camdens. Simon is enjoying having his new girlfriend, Anna, who he just met the day before over at his apartment for Valentine's Day. They both agree to go to Glen Oak, but he decides to keep her away from his family for the time being. Annie displays her unhappiness to Simon in song (along with the rest of passerbys) over his constant dating habits at the promenade as the chorus is going on. Anna overhears this and begins to question Simon and his dating habits as well. Vincent confronts an unhappy Ruthie on the high school bleachers as she's not in the Valentine's Day mood and is upset over watching Martin practice with his team and Zoe blowing kisses at him. Also, Lucy and Kevin dance to ""You Were Meant

Simon and Rose prepare for their wedding day, despite speculation that it is not the right decision. Annie and Eric go through countless scenarios in their minds as they reflect on how the wedding will actually turn out.Meanwhile, Rose's former boyfriend shows up unexpectedly. Ruthie considers studying in Scotland over the summer. Kevin, Lucy, Matt, and Sarah all have life-changing news, if only they can find the perfect time to share it with the family...and the surprises don't stop there!

After Eric agrees to take in a French exchange student (Guy) as a temporary border, no one but Ruthie suspects the young man is actually a con artist. Suave and romantic, the border attracts both Mary and Lucy after he flirts with them. Simon and Ruthie get sick when they try to smoke Guy's cigarettes. Also, Guy steals Matt's date. Lastly, Eric and Annie discover e-mail and chat-rooms on Guy's laptop computer and begin a romance with each other over the internet.

The Camdens, especially Lucy and Ruthie, grow concerned that an unusually joyful Annie isn't dealing with her true emotions following the death of her father Charles, but the happiness proves to be infectious as it soon spreads through the family and all over town. Meanwhile, Eric tries to convince an unhappy Chandler that he should consider adoption. At the same time Chandler is approached by a mysterious young girl who gives him a cryptic message before she disappears.

Racism comes to light at the high school when Alex, a new African-American student, wants to give a report on Dr. Martin Luther King, but his teacher argues that they have already covered that topic in class. When Martin inadvertently supports Alex's case, he falls victim to a hate crime. His car is defaced with racial slurs, and he refuses to wash it off until the culprit is caught. Meanwhile, for her own report, Ruthie attempts to recycle an essay that she wrote three years ago.

Lucy and Kevin celebrate their one-year wedding anniversary and contemplate whether they're ready to start a family, but things don't go off smoothly as Lucy refuses to drink champagne with Kevin during their anniversary dinner. Cecilia and Martin realize that their relationship may face a rocky future if Cecilia goes away to college. Chandler's foster son asks him to rid their house of all alcoholic beverages. Peter lies to Ruthie about his plans for the evening when she asks him to help her baby-sit the twins. With that, Peter goes missing, but concern turns to disappointment when Eric and Vic find him drinking alcohol with his friends at the park.

As election day approcahes, Ruthie is on a mission to develop her own opinions about politics after seeing how much Martin knows about world politics. Meanwhile, both Eric and Annie are suspicious that the other did not vote in the last election. Also, Lucy is feeling the pressure of registering to vote and is surprised to learn that Kevin hasn't changed his address and therefore isn't registered either. Eric is having a hard time teaching the twins that politics are not stupid. Lastly, the family gets a nice call from Carlos and baby Charles.

Mary tries to right a wrong by explaining to Lucy that she never had adult relations with her sister's fiance. The only problem left is trying to convince Lucy. Wilson unexpectedly drops by the Camden home from New York to see if he and Mary are really over by finding out her answer. James talks to Eric about him attempting to have an affair with Annie as Serena comes clean with Annie about her trying to have an affair with Eric. Robbie and Wilson set aside their differences so that they can talk about Mary. Matt learns a few things when it comes to Cheryl's honesty when she doesn't tell her friends that she's dating him.

Eric and Rabbi Glass pay a visit to the church to spy on the new associate pastor. Meanwhile, Ruthie is in big trouble when she's caught slow dancing with her boyfriend when she's supposed to be babysitting Sam and David. Meanwhile, Lucy asks Simon to dig up some information on Roxanne during his ride-along with her and Kevin in their patrol car. Lastly, Kevin has some explaining to do to Lucy after he runs into his ex-wife.

Eric tries to help Chandler after the young minister learns that his father is dying of lung cancer, but Chandler rejects Eric's aid and pushes him away. Lucy accepts a date with Chandler's chain-smoking tattooed brother Sid in order to make Kevin jealous enough to propose to her. Elsewhere, Annie is shocked when she finds a pack of cigarettes in Simon's bedroom. Lastly, Ruthie's friend Peter begs her to lie and not tell his mother that he smokes.

Annie's half-sister Lily shows up on her doorstep to discuss an important family matter after Annie refused to contact her. Eric tries to figure out why Annie won't contact Lily. Meanwhile, Cecilia sets Martin's friend Mac up with a girl from school, but he doesn't want to go out with her because of something embarrassing that happened ten years ago; Ruthie and Peter put a bad spin on a school project that lands them in trouble when they create a newspaper featuring false and derogatory stories about two former US presidents. Lastly, Roxanne turns to Chandler when she finds herself faced with a moral dilemma as she is keeping a secret from Kevin regarding Detective Michaels.

Annie's half-sister Lilly is getting married and wants their ailing father to walk her down the aisle but Annie worries that the strain might be too much for him. Meanwhile, Fred and Mrs. Bink attend premarital counseling with Chandler, but Fred's mother tries to put a stop to the wedding because she thinks Mrs. Bink is a gold digger. Lastly, Jimmy and Pat, two mentally challenged people, decide to get married after just one date and ask Chandler to perform the ceremony, but Jimmy's parents try to put a stop to it.

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.

Although he practices safe sex, Simon panics when his girlfriend of the moment, Sandra (guest-star Olivia Allen), confesses to him that she has an STD. Meanwhile, Martin and Mac (guest-star Kyle Searles) catch Ruthie's boyfriend, Vincent (guest-star Thomas Dekker), on a date with another girl. Also, Matt, Lucy, Kevin and Ruthie have second thoughts about telling Eric and Annie that Mary (Jessica Biel, who does not appear in the episode) is pregnant again, but also to hide the fact that she has deserted her husband Carlos and her baby son Charles. Lastly, Annie decides to go to New York to pay Mary a visit.

After discovering that Mary (Jessica Biel, who does not appear in the episode) has filed for divorce and signed away custody of her son, Matt is at a loss for how he should to break the awful news to Eric and Annie. Simon informs his new girlfriend, Rose (guest-star Sarah Thompson), that he won't have sex with her, but avoids telling her the reason behind his decision. She gets fed up with him but comes back to him when she finds out his true intentions for them---marriage. Meanwhile, Ruthie's boyfriend, Vincent (guest-star Thomas Dekker), asks Martin to get Ruthie to break up with him. Also, Eric gets involved once again with the Davis family children when little boy Danny (guest-star Drake Johnston) is being adopted by Cecilia's parents, George and Gwen (guest-star Brad Maule and Holly Fulger), but forgets to mention that the kid is part of a package deal as Danny has three sisters in Social Services as well, and try to take them in as well. Kevin is about fed up with Lucy as he's fr

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.

Eric Camden finds himself on a hung jury of a case that he considers ""open and shut,"" only to realize that he must help the other jurors regain their faith in the legal process in order to reach a fair verdict. Meanwhile, the other Camden's are suffering their own wrong doings as Annie and Ruthie ponder whether two wrongs make a right. Mary becomes in debt with Lucy after accidently giving her a black eye. Also, Simon and Deena realize that saying ""sorry"" can't turn back time, and Matt learns how important one person's voice can be.

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.

When Sandy's (Haylie Duff) father (guest star Michael McDonald) approaches Eric and Lucy with plans of helping his daughter, they are suspicious of the large sum of money he leaves with them. Meanwhile, Martin decides it's time to confront his father (gue

Annie and Ruthie spend the day together to unwind, while Lucy's world becomes complicated by both professional and personal news, and Eric unintentionally shakes up things between Rose and Simon.

When Ruthie and T-Bone work on a school assignment about the genocide in Darfur, they get the whole Camden family, and the community involved in the cause.

Ruthie tries to hide her tattoo from her parents, not realizing that they already know something's up with her. Lucy knows about the tattoo, but she has a very specific reason for keeping it to herself. As it turns out, most of the Camdens have dirty little secrets that they'd rather not reveal...

Annie discovers that the particularly flirtatious mother of one of Lucy's friends, Serena is seeing Eric for therapy sessions. Annie strongly requests that he refers her to someone else. Annie then has to deal with the guilt over her jealousy-induced interference between the two. Also, Simon is mortified when word gets around school over the fact that he's a virgin. Annie had shared the details of Simon's sexual inexperience with his ex-girlfriend's (Sasha) mother, Rita. Meanwhile, Matt struggles about telling Robbie he's interested with his ex-girlfriend, Cheryl. Lastly, Robbie is also hiding a secret from Matt that involves his ex-girlfriend Heather.

Simon's paid dating service is becoming profitable until Cecilia rats him out to Eric. When Mary threatens to leave home over her relationship with Jack Smith, who is twice her age, Eric confronts Jack who lets the news slip that he and Mary are relocating to Fort Lauderdale. Lastly, Kevin sets Ruthie straight on who's the adult and who's the child in this household.

Eric's strange post-surgery behavior leads him to make a life-altering decision that shocks and worries Annie. The reverend considers another calling when the ministry begins to lose its appeal. His plan to abandon his religious duties is hatched after a new neighbor mistakenly calls him Mr. Camden. Fed up with everyone bringing their problems to him, Eric becomes more and more apathetic toward his family and community. Meanwhile, Lucy turns to the new associate pastor for advice when she sees Kevin and Roxanne having too much fun dancing at the pool hall. Concerned when he can't find Lucy, Kevin interrupts Simon and Cecilia's date to enlist their help.