On a temporary leave from military duty in Iraq, Martin's father (guest-star Costas Mandylor) pays the Camdens a visit to help his son decide whether to forgo college for a career in professional baseball. However, the visit turns sour when Martin catches his father kissing Roxanne. Meanwhile, Chandler and Paris (guest-star Shannon Kenny) reevaluate their relationship in the wake of her ex-husband's return, and Roxanne comes to blows with Martin's aunt (guest-star Keri Lynn Pratt) over their differing views on the war in Iraq. Lastly, Vic tries to join the Marines and talks to a supervisor over the matter.

The episode was rated 7.71 from 17 votes.

It's Camden chaos all around when Matt (guest-star Barry Watson), who is having problems in his marriage to Sarah (guest-star Sarah Danielle Madison), returns to Glenoak for a visit and runs into his ex-girlfriend Heather (guest-star Andrea Ferrell) on his flight to Glen Oak. Simon (guest-star David Gallagher) unexpectedly announces he's coming home for the summer. Also, Lucy sets out to discover why Roxanne is suddenly too busy to hang out with her as she's convinced that Roxanne is secretly trying to become a detective behind Kevin's back. Ruthie keeps a secret about a fellow student from her parents. Lastly, Martin learns that his baseball teammates think he's having sex with Cecilia

The episode was rated 7.79 from 14 votes.

Prospective homeowners Lucy and Kevin are ready for a fight to the finish when they learn that Chandler and his soon-to-be-adopted son Jeffrey (guest star James Henrie) are their rivals in a bidding war on a house. However, the conflict sparks an idea with Eric and Annie who decide to use their savings to buy their house from the church. Meanwhile, Ruthie is upset with Martin because she thinks he will get the garage apartment instead of her when Lucy and Kevin move out, and Peter suspects that his dad, Vic (guest star Bryan Callen), might be having an affair.

The episode was rated 7.79 from 14 votes.

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 (guest-star Bryan Callen) find him drinking alcohol with his friends at the park. Lastly, a new couple in town calls on Eric and Annie for help...on decorating their new home.

The episode was rated 7.81 from 16 votes.

Matt (guest-star Barry Watson) returns home to tell Eric and Annie that Sarah has left him and he's dropping out of medical school. Rabbi Glass offers Matt marital advice. Meanwhile, Kevin must decide whether or not to tell a very jealous Lucy that his ex-wife (guest star Mindy Burbano) is in town and they got invited to dinner with her. Martin's aunt (guest star Keri Lynn Pratt) asks Eric to step in and talk Martin into moving to New York with her and Chandler asks Peter how he would feel about Chandler marrying his mother someday. Peter thinks something is amiss when his mother goes out of town for a business trip. Ruthie keeps something from her mother.

The episode was rated 7.85 from 20 votes.

Eric arranges for Peter and his dog to visit a drug rehab center to cheer up the patients. Peter bonds with Nick (guest-star Joe Penny) and helps him reconnect with his estranged son. Meanwhile, a very uncoordinated 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 (guest-star Shannon Kenny), Chandler receives a letter from Roxanne telling him she still loves him. Martin (guest-star Tyler Hoechlin) 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.

The episode was rated 7.89 from 19 votes.

Mary (guest-star Jessica Biel) makes a surprise visit home to deliver unexpected news to Eric and Annie. Meanwhile, Simon tells Cecilia (Ashlee Simpson) that he needs space. Also, Lucy and Kevin adjust to married life. Chandler breaks up with Roxanne after learning that she isn't comfortable with the idea of being a preacher's wife, while Roxanne seeks Kevin's advice on dealing with a dispirited Chandler. Also, the Camdens finally learn who's pregnant. Lastly, Eric ponders Simon's academic future and Annie prepares for a potentially tense dinner engagement.

The episode was rated 7.91 from 22 votes.

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, which leads to a meeting with a lawyer (guest-star Randy Spelling). At the same time Chandler is approached by a mysterious young girl who gives him a cryptic message before she disappears.

The episode was rated 7.94 from 16 votes.

When a mysterious stranger, Martin (Tyler Hoechlin), wanders into the Camden home and spends the day with the family everyone assumes he is Simon's friend. Meanwhile, a disheveled, Rabbi Glass (Richard Lewis) stops by to confide in Eric that he caught his wife (Loraine Newman) kissing another man and discusses about splitting up. Kevin feels emasculated after being attacked and injured by a woman during a domestic disturbance call and goes on medical leave. His attitude toward Lucy changes drastically as he worries that Lucy isn't attracted to him anymore. Plus, Simon is concerned that no one seems to care that he's leaving for college in a couple of days. Lastly, Ruthie and Peter struggle with a school project.

The episode was rated 7.95 from 20 votes.

With Annie out of town, Eric is left alone to accompany Simon on his visit to the Board of Education to discuss early graduation. During the meeting, Simon bonds with his advisor, Maynard (guest-star Cirroc Lofton), when they realize that they're both preachers' kids. Meanwhile, Lucy catches Chandler kissing a beautiful blonde woman at church and she agonizes over whether or not to tell Roxanne; Kevin's (George Stults) boss, Detective Michaels (guest-star Christopher Michael), tricks him into babysitting his six-year-old granddaughter; Peter makes a deal with the school bully in an attempt to protect Ruthie and Cecilia agrees to watch the twins which leads to a confrontation with Simon.

The episode was rated 8.00 from 18 votes.

Eric (Stephen Collins) is brought in by the school board to help investigate the local high school Principal, Ms. Jones (guest-star Meredith Baxter), when more than one concerned parent questions her behavior. When a female student disappears, all fingers point at Ms. Jones, but Eric believes strongly that the student's father may be the real culprit. Elsewhere, rumors about Martin (Tyler Hoechlin) upset Cecilia, who then regrets talking to Ruthie about her feelings.

The episode was rated 8.06 from 18 votes.

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. Meanwhile, Ruthie and Peter, who get lost during a school field trip, 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 during the civil war in Sudan. Ruthie and her boyfriend Peter get stranded after accidentally 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.

The episode was rated 8.29 from 14 votes.

In the eighth season premiere, the Camden's spend the last week of summer at a beach house. At the beginning of the summer, Simon killed Paul Smith in an automobile accident. Simon is having a hard time dealing with the fact that he killed him and everyone tries to help him. Eric and Annie try to push Simon to go back to school which begins in a week. Eric would like Paul's parents (guest-stars Katie Mitchell and Mark Moses) to accept the insurance companies offer to the money. Paul's brother vandalizes the church by adding graffti to the sign saying "Thou Shalt Not Kill." Simon runs away to New York to get away from the troubles he is having in Glen Oak. Also, Lucy and Kevin discuss possibily having a child. Peter is spending a lot of time around Ruthie and the Camden family. Ruthie finds out about Mary and Carlos being married.

The episode was rated 8.30 from 23 votes.

The Camden chaos continues with Matt (guest star Barry Watson), who is trying to salvage his marriage, questioning whether he still has feelings for his ex-girlfriend Heather (guest star Andrea Ferrell); Simon's (guest star David Gallagher) return to Glenoak creates conflicted feelings for his ex-girlfriend Cecilia, who is torn between her feelings for Simon and her current boyfriend Martin; Ruthie's foreign exchange student friend Maria (guest star Samantha Sandoval), appears to be making the moves on Ruthie's boyfriend Peter; and grandparents-to-be Eric and Annie hop a plane for New York, despite Mary's (Jessica Biel, who does not appear in the episode) repeated pleas for her family to stay away during labor.

The episode was rated 8.33 from 12 votes.

Annie's half-sister Lilly (guest-star Michelle Phillips, "Knots Landing" and musical group "The Mamas and The Papas") is getting married and wants their ailing father to walk her down the isle but Annie worries that the strain might be too much for him. Meanwhile, Fred (guest-star Al Ruscio) and Mrs. Bink (guest star Eileen Brennan) attend premarital counseling with Chandler, but Fred's mother (guest-star Carol Arthur) tries to put a stop to the wedding because she thinks Mrs. Bink is a gold digger. Lastly, Jimmy (guest-star Glen Poehlman) and Pat (guest-star Pam Rawuka), two mentally challenged people, decide to get married after just one date and ask Chandler to perform the ceremony, but Jimmy's parents (guest-stars Dick Van Patten and Patricia Van Patten) try to put a stop to it.

The episode was rated 8.33 from 15 votes.