The film opens with a montage of scenes reflecting life in the 1990s, with heavy traffic, rushing commuters, and homeless people on the street. Larry Dittmeyer (Michael McKean), an unscrupulous real estate developer, explains to his boss that almost all the families in his neighborhood have agreed to sell their property as part of a plan to turn the area into a shopping mall. The only exception is one family, which prompts his angry boss to ask, "What's their story?" which leads into the opening blue-box credits of The Brady Bunch.The concept of the film is that although it is set in the 1990s, the Brady family are still portrayed as their 1970s television incarnations and are unaware of the disparity between their lives and their surroundings. The parents, Mike (Gary Cole) and Carol (Shelley Long), are having breakfast prepared by their housekeeper, Alice (Henriette Mantel), while the six children prepare for school. Jan (Jennifer Elise Cox) is jealous of her elder, popular sister Marcia (Christine Taylor); Cindy (Olivia Hack) is tattling about everything she's hearing; Greg (Christopher Daniel Barnes) is dreaming of becoming a singer; Peter (Paul Sutera) is nervous that his voice is breaking; Bobby (Jesse Lee) is excited about his new role as hall monitor at school.Cindy gives Mike and Carol a tax delinquency notice (which was earlier mistakenly delivered to the Dittmeyers) stating that they face foreclosure on their house if they do not pay $20,000 in back taxes. The two initially ignore the crisis, but when Mike's architectural design is turned down by two potential clients, he tells Carol that they may have to sell the house. Cindy overhears this and tells her siblings and they look for work to raise money to save the house, but their earnings are nowhere near enough to reach the required sum.In a subplot, Marcia is asked by popular Doug Simpson (Shane Conrad) to go to the school dance with him, when she had already promised to go with nerdy Charlie Anderson (R.D. Robb). She explains the "difficulty" of the choice to her friend, Noreen (Alanna Ubach), unaware that she is a lesbian and is herself attracted to Marcia. Marcia ends up breaking her promise to Charlie. On the night of the dance, Doug takes her to a lookout point where he French kisses her, only for her to say that she's not interested. He abandons her at the side of the road, but she is rescued when a limousine arrives. She later arrives at the dance and introduces the star performer of the night, Davy Jones. He gets a rousing reception from the teachers, and when the backing rock band charges up his performance, the kids respond, too. Marcia apologizes to Charlie, who forgives her and asks her to dance with him.Larry discovers that the Bradys have past-due property taxes and confronts Mike, only to learn that he has finally sold one of his designs and has the money he needs. Larry secretly meets with the client, claiming (falsely) that Mike's design resulted in a building collapse, which causes him to lose his advance. On the night before the Bradys have to move out, Marcia suggests that they enter a "Search for the Stars" contest, the prize of which is exactly $20,000. Jan, having originally suggested this and been rejected, runs away from home. Cindy sees her leave and tattles, and the whole family goes on a search for her. They use their car's C.B. radio, and their transmission is heard by Schultzy (Ann B. Davis), a driver who picks up Jan and convinces her to return home.The next day, the children join the "Search for the Stars" contest with a dated performance that receives poor audience response compared to the more modern performances of other bands. However, the judges — Jones, Micky Dolenz, and Peter Tork, all of the 1960s band The Monkees — vote for them, and they win the contest as a result. The tax bill is paid and their neighbors withdraw their homes from the market, foiling Larry's plan and securing the neighborhood.The film ends with the arrival of Carol's mother (Florence Henderson), who finally convinces Jan to stop obsessing over Marcia, only for Cindy to start feeling jealous of Jan.In the end credits, the Bradys are in their traditional blue boxes, but are updated for the time and include various humorous outtakes, such as Marcia taking over Jan's box, and grandma coming into Peter's box.
- Aline, Alisa, Buzz, Cara, Caroline, Cluadio, David, Emily, Eric, Estuardo, Frances, Francesco, Garret, Jared, Jessie, Kaliegh, Keiko, Kenny, Kortney, Kyle, Lynese, Matt, Maya, Mike, Nick, Noreen, Pablo, Rachel, Ray, Shing Ying, Taylor, Zoe, Nat, Alex, Thomas Batuello, Allie DiMeco, David Levi, Qaasim Middleton, Cooper Pillot, Jesse Draper, Michael Wolff, Pepper, Molly, July, Duffy, Kate, Tessie, Oliver, DJ, Stephanie, Michelle, Aaron, Denise, Derek, Harry, Rusty, Teddy, Walter, The All That Gang, The Shake It Up Gang, Zack, Cody, Maxx, Sarah Baker, Jake Baker, Henry Baker, Lorraine Baker, Nigel Baker, Kyle Baker, Kim Baker, Jessica Baker, Mike Baker, Mark Baker, Leo Little, Cake, Amy, Miracle, Benjamin, Max Keeble, Megan, Robe, Richelle, Ben Hilton, Jamie, Max, Becca, Nicky, Jeannie, The Flash/Tony, Crispin, Dylan, Duncan, Sean, Tony's Brother, German Speaking Boy, Juel, Erin, Benny, Lina, Henry, Kiki, Aldo and his friends, Alvin, Brittany, Simon, Jeanette, Theodore, Eleanor, Tommy, Dil, Chuckie, Phil, Lil, Kimi, Angelica, Susie, Emily Yeung, Daniel Cook, Ramona, Tina, Kim, Casper, Wendy, Carly, Spencer, Sam, Gibby, Freddie, The Baby-Sitters Club Gang,Casper, Wendy, Jazmine Payne, Carly Shay, Spencer Shay, Freddie Benson, Sam Puckett, Gibby, Nigel Baker, Kyle Baker, Mike Baker, Mark Baker, Jessica Baker, Kim Baker, Sarah Baker, Jake Baker, Henry Baker, Lorraine Baker, Cooper, Dylan Schenk, Ben Hilton, Jamie, Max, Becca, Nicky, Jeannie, The Flash/Tony, Crispin, Dylan, Duncan, Sean, Tony's Brother, Juel, Erin, Shirley Temple, The Barney & Friends and the Gang, German Speaking Boy, The Chipmunks (Alvin, Simon, and Theodore), The Chipettes (Brittany, Jeanette, and Eleanor), Aldo, Ethan, Miarissa, Bina, Ely, Otter, Tilly, Tom, Tiny, Ramona, Tina, Teddy, Denise, Derek, Harry, Rusty, Walter, Max, Sharkboy, Lavagirl, Linus, Marissa, Ely, Otter, Bindi, Rosie, Kelly, Lynn, Annie, Molly, Pepper, Duffy, Kate, July, The Fraggle Rock Gang, Andy, Ruby, Gracie, Kyle, Chyna Parks, Olive Doyle, Fletcher Quimby, Lexi Reed, Cameron Parks, Nat Wolff, Alex Wolff, Thomas Batuella, Allie DiMeco, David Levi, Qaasim, Cooper Pillot, Jesse Draper, Brandon Quintin Adams & Friends, Spanky, Stymie, Froggy, Porky, Buckwheat, Uh-Huh, Waldo, Mary-Ann, Jane, Rascals #1, 2, 3, and 4, Friends of Stymie and Uh-huh, Darla, Alfalfa, Little Carbon Soldiers, Becky O'Shea, Junior Floyd, Jake Berman, Rudy Zolteck, Tad Simpson, Hanon, Marcus, Timmy Moore, Nubie, Johnny Vennaro, Briggs, Patterson, Priscilla O'Shea, Murphy, Keith, Marcus, Hector, Jessica, Lisa, Shock, Pete and Pete, Pablo, Tyrone, Tasha, Uniqua, Austin, Paul, The Oslen Twins, Calvin Cambridge, Murph, Ox, Marlon, Reg Stevens, Max Keeble, Megan, Robe, Kevin McCallister, Alex, Leah, Matilda, Penelope, Matthew, Dwayne, Steve, Robert, Nelly K., Sonny, Tawni Hart, Chad, Dylan Cooper, Nico Harris, Grady Mitchell, Zora Lancaster, the Baby-Sitters Club gang, Simba, Nala, Timon, Pumbaa, Baloo, Kovu, Kiara, Uncle Max, Ma, Taran, Princess Eilonwy, Fflewddur Fflam, Gurgi, Jesse Greenwood, Elvis, Randolph Johnson, Nadine, The Goonies (Mikey Walsh, Brand Walsh, Mouth Devereaux, Data Wang, Chunk Cohen, Andy Carmichael, Stef Steinbrenner, and Sloth Fratelli), Scooby-Doo, Shaggy Rogers, Fred Jones, Daphne Blake, Velma Dinkley, Yogi Bear, Boo-Boo Bear, Snagglepuss, Huckleberry Hound, Quick Draw McGraw, Augie Doggie and Doggie Daddy, Wally Gator, Magilla Gorilla, Top Cat, Peter Potamus, Woody Woodpecker, Ttark, Toaster, Lampy, Radio, Blanky, Kirby, Fievel Mousekewitz, Tiger, Tony Toponi, Tanya Mousekewitz, Yasha Mousekewitz, Papa Mousekewitz, Mama Mousekewitz, Charlie Barkin, Itchy Itchiford, Hubie, Rocko, Jack Skellington, King Louie, Genie, Louis, Sebastian, Alex, Marty, Melman, Gloria, King Julien, Maurice, Mort, Roger Rabbit, and The Entire LionKingHeart Fantasy Films team and the rest of the characters will guest star in this film. will guest star in this film.