Cody is writing a 40's style mystery for his creative writing class. He gets an idea when Karen proclaims her diary is missing. His pun-filled story is played out by the Lambert/Foster family. Kitty Meow (Karen), who sings in the famous trio the Andrews step-sisters, lost her diary. The suspects are as follows: the other two Andrew's step-sisters (Dana and Al), the establishment's piano player (Brendan), comic (JT), and other singing act, Miss Honey Dew (Carol). With the help of the lab technician (Mark), Sam Spud (Cody) discovers it was Honey Dew. In real life, Al turns out to be the one who misplaced Karen's diary.

A flirtatious girl disproves J.T.'s claim that a guy "would never trash a friendship over some stupid chick."

Everybody is excited about the prospect of moving into a brand-new house--except Lilly.

Cody returns and gives Frank and Carol $50,000, which causes nothing but trouble as they decide how to spend it.

Dana sneaks out to hear her favorite singer at a bikers bar.

Cody makes the world's largest Jack-o-Lantern and Mark discovers an alien life.

J.T. and Cody are out riding around in J.T. boss's car.When J.T. meets a pretty girl,at a cafe.She thinks he's rich and so J.T. lies and says he is, to impress her.He then finds some money on the street and decides to keep it.Not knowing it actually belongs to Shelly's Dad who owns the cafe she works at.Cody finally makes J.T. tell her the truth and J.T. fines out about the money and returns it and apologizes for lieing.They decide to try and start over.

Al is learning to drive, but she gets into a predicament when JT lets her drive while Frank and Carol are away at the doctors. Meanwhile, Dana has her wisdom teeth removed, but the drugs get to her head.

Al feels compelled to check up on Matt when she learns he'll be on a ski trip with Stephanie "Love Boat" Leifer.

Al, angry about being an understudy at a local play, refuses to learn her lines--something she regrets when the leading lady gets sick opening night.

J.T. hires an aspiring model to be the family's maid; and Carol gets overly involved in Karen's cheerleading tryouts.

A truck giveaway causes friction between Frank and JT; a women's safety seminar is a big hit thanks to a hunky cop.

It's christmas time at the Lambert/Foster's and J.T. decides he's to old to spend Christmas with the family and he wants to go skiing with his buddies.Frank doesn't want him to, but doesn't object.J.T. realizes the minute they arrive at the cabin that he made a mistake and would rather go home.He calls Cody and confesses, but refuses to call Frank.Cody talks Frank into going to see J.T. and he admits he would rather be home with the family and Frank says he wants him home too.

Cody's a roadie---"the coolest job in the world"---for singer Christi Rose, who asks him to become her bodyguard.

Dana feels compelled to compete with an old female buddy of Rich's; Frank's troublesome cousin Bert reappears.

Frank and Carol attend their 25th high-school reunion, along with Frank's old rival; Rich and JT charge pals to watch a bikini contest on TV.

JT and Dana are in the same Ethics class, and JT gets an ""A+,"" while Dana gets a lower grade. Dana goes to inquire about her grade and discovers that the only reason JT got his grade is the teacher is interested in him. Dana warns JT and tells him that his first time should be special. When JT goes over to the Professors, he abstains from any wrongdoing, and in Dana's words, ""deserves an 'A+' in Ethics. Frank buys the Meat Master 5000, but does not assemble it correctly, and it starts a fire. Cody is having trouble sleepwalking and talking like a 5-year-old, warning Carol to get to the hospital. He discovers it is related to seeing his sister be born in the back of a cab, when he was five.

With Frank and Carol out for dinner, Dana, Karen and Al are left to watch their new baby sister.

Al takes a job at a cookie store and has to work alongside the company mascot, Mr. Chips the chimpanzee.

Dana brings her boyfriend Fleming home, and he promptly psychoanalyzes Frank.

JT falls for an aerobics instructor; Carol has a fight with Dana, who decides to get even by eloping with Rich.

Mark feels his friends don't respect him, and his mother babies him. In order to earn respect he joins a Karate class. His teacher kicks him out for being too wimpy. Cody agrees to help Mark prepare for the big karate tournament (Cody is a black belt) in a month and Mark becomes a totally new man. He faces the best person in the first match and falls behind quickly. Cody, however, notices his weakness and Mark uses it to catch up and force the guy to the final point. Mark loses the match, but wins respect from everybody except the coach of the other guy who mocks him and Cody and then challenges Cody to a karate match. Cody beats him badly. Frank is tired of all the yelling in the house so he installs an intercom that has a radio in it, but he is forced to destroy it when it wakes everyone up in the middle of the night.

Everyone begins to help Carol so she will not be stressed out too much and harm the baby. Carol, however, is so fussy about how they help that she drives them all crazy and seems to be just as stressed. Brendan, however, stays up all night cleaning to help. Dana and Cody are selected to teach a bunch of remedial high school students about the Civil War. Cody signs them up for a hit TV game show, ""It's Academic,"" and wants a more hands-on kind of teaching. Dana fights Cody on both until the competition, where she gets so into it, she threatens her team. The students respond to both Cody's teaching and Dana's coaching.

Cody, J.T. and Mark suspect their new neighbor is a jewel thief. Meanwhile, Dana moves out and loosens up a little too much.

Mark scores points for the guys on the "geek wall" at a dance; Dana attempts to stir interest in a feminist study group; Frank and Carol experience a day at a health spa.