A shaggy dog follows Steve home and does not want to leave. The dog loves Steve and sings howling songs to him, disrupting all the neighbors. Steve has a difficult time leaving the house to go to work.
Maggie Bellini, a wealthy businesswoman, promises to match the money that Bryant Park raises to build an art center. She meets the Douglas family and is interested in Steve. She tries to buy his attentions by giving gifts to the others.
Robbie saves Terri Wong from getting hit by a car. She tells Robbie that according to Chinese custom, she must do everything for him. He enjoys the attention at first, but it becomes awkward when she continues day after day.
Robbie meets a female explorer and she stops by his house. There the family meets her and she stays for dinner. Steve asks her out and they date while she is in town. When she leaves for another safari, she asks Steve to go with her.
Tina Cole plays Joanne. (In Season 8, she joins the cast as Katie.) Robbie & Joanne think being married while in college is easy when their friends seem to manage. They find it is not easy when they babysit the friend's child.
Steve and Chip deal with females in non-traditional male activities. Steve works with a female engineer who acts like a man and dresses in overalls at work. A female student signs up for the Track Team at school and Chip thinks it is wrong.
Uncle Charley tells Steve that Robbie is going steady with two girls. Steve talks to Robbie, but Robbie says he can handle it. One day, the two girls meet and start to compare notes on their very similar boyfriends.
After learning about the Statue of Liberty in school, Ernie decides to write a thank you letter to the French Ambassador in Washington DC. The Ambassador is touched, and invites the Douglas family to visit in Washington.
Ernie's girlfriend is an older classmate who is more interested in his stamp collection than him. Once she has the stamp she wants, the friendship is over. Meanwhile, Robbie is working on a school project but he has girls do all the work.
Ernie notices that a rare coin in his collection is missing and accuses Chip of swiping it. A kangaroo court is held and Chip is acquitted. Ernie then finds the coin and realizes Chip was innocent all along.
Steve attends a bachelor party for an older co-worker, expecting just a simple dinner. However, a dance girl was hired, and the party is raided by the police. Steve helps the girl slip out the back and things get complicated after that.
When preparing for a business trip, Steve realizes he could drive and take the time to stop at the town where he grew up. He takes the whole family on a vacation with him. He walks down memory lane, and the boys enjoy the trip.
Steve gets a letter from a woman he supposedly dated a long time ago who says she'll be in town and would like to get together. She appears to remember an awful lot about Steve including his likes and dislikes, and keeps calling him Stevie. On the other hand, try as he might, Steve does not remember her at all.
Chip and Ernie's school holds a father and son competition in the school subjects. The sons easily beat the fathers with the subjects they have been learning. A rematch is held on a local television station.
For entertainment, the family decides to play music together. Everyone has an instrument to play - except for Ernie. Uncle Charley tries to teach Ernie to play the violin, but finds out Ernie has no talent for music.
Robbie tries to earn extra money by starting a birthday cake delivery service at his college, meanwhile the family forgets Steve's own birthday. The home business goes great until it gets overwhelmed with orders, and health authorities get involved. Spoiler alert: The episode ends with a colorful cake and pie tossing fight in the Douglas' kitchen.
Robbie isn't doing well in his chemistry class and hires a tutor recommended by his professor. The tutor turns out to be an attractive older woman (Susan Oliver), and Robbie thinks he's in love, but he's concerned about the age difference. Complications arise when Robbie discovers that his tutor is actually dating his father, Steve, who is concerned about dating a younger woman.
Chip (Stanley Livingston) goes on a date with a teen movie star (Sherry Alberoni) thanks to Ernie (Barry Livingston), who had requested a photo of her as a birthday present for Chip. The studio's publicity man (Tommy Noonan) arranges to send the actress, in person, to Bryant Park, but Chip becomes disenchanted by all the attention which she is getting.
While on a business trip, Steve and a co-worker go to see a past-her-prime lounge singer (Jaye P. Morgan) with a dwindling audience. After learning that the club is letting her go, Steve invites her back to Bryant Park to learn a hipper music style from Robbie's band. When the band invites her onstage at their next gig, the kids in the audience are unenthusiastic at first, but soon dig the new singer.
Ernie learns that the person with the least experience at his father's company has been laid off - his father explains that it is unfortunate, but that is just how it goes sometimes. When Ernie discovers that he's allergic to Tramp, he decides to leave home and look for a new family to adopt him, because Tramp has been with the family longer than Ernie, so Ernie is low man on the totem pole.
Chip wants to take his girl friend from school to a party. She lives with her grandma who is old fashioned and doesn't think she should date until she's 16, so chip gets some advice from Uncle Charley that eventually works. But Chip finds that once he stirs up old memories in Grandma its not going to be easy to get out of the house.