After Jill explicitly tells Tim not to touch the dishwasher, he breaks it in an attempt to make it more powerful; more of a "man's" dishwasher. Jill has a job interview, but she doesn't get it and when Tim tries to comfort her, he only makes matters worse. After talking to Wilson, Tim tries again and succeeds.
The K&B Construction guys are invited on Tool Time to show how to make hot gourmet meals while on the job site. They use the tools of their trade to make meals anyone would be proud of. At home, Jill is fed up with Brad and Randy excluding Mark from their games so she has a talk with them. Brad and Randy tell Mark that they, along with Tim and Jill, are aliens from outer space.
Jill has planned a romantic surprise dinner for Tim, who is at Big Mike's with Al and the guys from K&B Construction. He phones home and she flirts with him, and he doesn't notice and comes home two hours late. Jill is upset and accuses him of not picking up all the signals she sends. Tim thinks that signals should be clear and dresses up as Fred the phone repairman so he can fix the problem. Brad is wondering whether Jennifer pounding him is a sign that she wants to kiss him.
Jill's sister Carol is having a baby girl. When they talk about the baby's name and Jill is going through the boy's baby toys, she wishes she could have a baby girl. Tim tells Randy and Brad that Jill always wanted a girl so they tell Mark that Jill wished he had been a girl. This upsets Mark and when Jill wants to bake a cake with him, he doesn't want to. When she finds out the truth, she tells Mark that what Randy and Brad told him isn't true. Tim is also upset because he doesn't want another child. But he feels alright again when Jill tells him that they don't have the time for another child.
Tim has trouble with Joe Morton, his new neighbor, after Joe dents part of his hot rod. Jill becomes good friends with Marie Morton, Joe's wife. Brad signs up for home ec. as his elective to meet girls, but when the other boys in school find out about his plan, it doesn't work out the way he planned.
Randy and Brad constantly fight over the shared room. They both need their privacy, but their house won't allow them to build another room, so Jill and Tim are considering all options. However, when Tim runs out of patience with Randy and Brad's endless bickering, he moves the boys without Jill's consent. Of course, Jill doesn't like that.
When Irma can't host her show (Cooking with Irma) for a week, she asks Al to fill-in as host and Tim to be his assistant. Tim has a hard time not being the center of attention, but when Jill shows him that he can assist her he decides to continue to help Al. Randy finds it hard to talk to a girl in his class named Beth.
Harry offers to sell Tim 20 percent of his hardware store (that Harry's brother is selling). Jill doesn't let Tim buy it, so Al decides to purchase it. When Al becomes obsessed with the store, this drives everyone crazy, even Ilene when he skips a date with her, and Tim decides to confront him about it. Brad and Randy try to beat Mark, as Al in a Halloween costume contest, but Mark wins because Al's mom was the head judge.
Jill finds Brad making out with his girlfriend in his room. When Jill asks Tim to have a man-to-man talk with Brad, Tim is a little reluctant to do it. Not because he doesn't feel Brad needs it, but because it's something he's never done before with a kid. Tool Time goes to sea in another on-location shoot, with Tim, Al and Heidi boarding the USS Constellation aircraft carrier as part of their salute to engines.
It's a battle of Halloween pranks. First Tim scares Al, then Brad and Randy scare Jill, then a strange man shows up at the door asking to see the basement. Jill, Tim and Wilson tell the boys that years ago a man named Clifford Warren was accused of killing his brother, but because of his mental problems he was put in an insane hospital. Little do the boys know that it's a Halloween prank. They invite Al to help them pull a prank on their own, but Al and Wilson pull a prank on the Taylors.
Tim begins to want to have more children after Marty asks him to babysit one of the twins. After some discussions about his vasectomy with Jill, and some words of wisdom from Wilson, he decides that being able to return the twins after playing with them is the best idea. Mark is still wearing black, but with an added touch (of lipstick) for this episode.
On Tool Time, Tim and Al show viewers how to prepare for a severe winter storm. When Tim falls through the gazebo he discovers a small bag of marijuana taped to the underside of the swing. Jill and Tim stake out their backyard from Wilson's to catch the culprit... to everyone's surprise, Brad is caught red-handed with the goods.
Tool Time is revisited by Astronauts Ken Bowersox and Steve Hawley, who announce that a Binford tool will be used on their next shuttle mission. Will Tim or Al win the competition to be the one to use the tool in space? Back on Earth, Mark tries to impress a girl by making a dramatic change to his appearance.
Tim records his finale Tool Time, with a host of guests - and a pregnant Heidi. Morgan offers Tim more money and an executive producer credit to stay with the show, but Tim rejects his offer. Jill makes a decision about the Indiana job offer. Wilson and Tim take down their fence to make more room for Al and Trudy's wedding. Harry and Delores return for the happy occasion, while Benny, Marty and Jeff bet on the outcome. The Taylors decide to go to Indiana, taking their house with them in the ultimate home project - or is it just a figment of Tim's imagination?