Marcia and Jan announce that they are both getting married and plans soon begin for a double wedding.

The wedding plans hit a snag when the two couples (Jan and Phillip, Wally and Marcia) disagree on what type of wedding they want. Jan and Phillip want a traditional wedding, and Marcia and Wally want a modern wedding.

After the weddings, the two couples look for a house, with help from Brady mom, Carol, who has become a real estate salesmen. After all the houses they see turn out to be to expensive, they decide to share a house.

Toysalesmen Wally beings home a gigantic stuffed gorilla that upsets Phillip because a professor friend of his is coming to visit. The Brady Girls learn how to defend themselves which helps them when a burglar visits.

When Bob Eubanks' car breaks down, he enters the Brady household and calls his 'people' from there. Marcia and Jan get very excited over his presence and get him to invite them to appear on The Newlywed Game. When they finally end up playing, both couples lose.

Pandemonium results when Carol Brady temporarily moves in with her newly wedded daughters and their husbands. Carol Brady's first night in her daughters' house turns into a harrowing experience for everyone as sleeping arangements are stretched to the limit.

When the FBI comes to visit, Wally thinks they're after him for some overdue parking tickets. In reality, they came over to talk to Phillip about government funds he requested for school. Wally then impersonates Phillip to try to escape.

Phil tries to change his personality so he'll become more popular.

When Marcia's male models for a fashion show go on strike, she cons Wally and Phillip into taking their places.