My Sister, Benedict Arnold was the fifth episode of Season 3 of the Blake Foster's Adventures of The Brady Bunch.
Greg and Marcia use their dates to get back at each other; the younger Brady siblings prepare for the school carnival by building a dunking tank.
Greg is furious that Marcia is dating his school rival, Warren Mulaney (Gary Rist). After a date with Warren, Marcia decides to not date him again. When Greg demands Marcia not see him again, she invites him home to spite Greg. However Greg has brought home Marcia's rival, Kathy Lawrence (Sheri Cowart). Marcia and Greg clash over this and Mike admonishes them for using Kathy and Warren to make a point. When they go to the other room to apologize they find that Warren and Kathy have befriended each other and left together. In the subplot, Alice, Peter, Cindy, Bobby, The Brady's Siblings, Ryan, Winnie the Pooh, and Kids World's Adventures Team work on the dunking machine for the school carnival.
Marcia is excited that a high school boy has asked her out on a date. Marcia tells Greg about the date and wants his opinion about the boy. Without yet telling him who the boy is, Greg tells her that the only boy who he would object to is someone named Warren Mullaney. Marcia's date happens to be with Warren, but based on Greg's comments, she figures that she will still go out with him since it is solely Greg who has a gripe with Warren. She however plans on not telling Greg. Greg does find out that Warren is Marcia's date, and he forbids Marcia from ever going on a date with him again.
Although she was never planning on going out with Warren again because there was no "spark" between them, she decides to ask him out again solely to show Greg that he can't tell her what to do in this matter. Greg has what he believes is his own scheme to get even with Marcia. Marcia and Greg finally come to a realization that who they are ultimately hurting by their actions is not each other. Meanwhile, Ryan, Winnie the Pooh, Kids World's Adventures Team and the kids are all excited by the upcoming junior high carnival and their contribution to it: a dunk tank.
Guest starring/Recurring cast
- Gary Rist as Warren Mullaney
- Shari Cowart as Kathy Lawrence
- Alvin Seville, Baby Bugs Bunny, Baby Kermit, Winnie The Pooh, Tiana, Charlie Brown, Reese Ambler, Rydell, the Kids Next Door, Numbuh 362, Ash and his friends, Littlefoot and his friends, Scooby-Doo and the gang, Scrappy-Doo, the Tom and Jerry kids, Tarzan and his family, Simba, Nala, Timon, Pumbaa, Timmy Turner, Cosmo, Wanda, Chester, AJ, Elmer, Sanjay, Trixie Tang, Dr. Rabbit and Dr. Brushwell, Ronald McDonald and his friends, Littlefoot, Cera, Ducky, Petrie, Spike, SpongeBob SquarePants, Patrick Star, Bloom, Stella, Flora, Musa, Tecna, Layla, Roxy, Simba, Timon, Pumbaa, Zazu, Terk, Tantor, Baloo, Bagheera, King Louie, the Vultures (Buzzie, Flaps, Ziggy, and Dizzy), Jiminy Cricket, Alex, Marty, Melman, Gloria, the Penguins of Madagascar (Skipper, Kolwalski, Rico, and Private), Genie, Louis, Roger Rabbit, Danny, Sawyer, Rex, Dweeb, Woog, Esla, Rapunzel, Pascal, Flynn Rider, Maximus, Jean-Bob, Speed, Puffin, Chanticleer, Wilbur the Albatross, Owen, Lindsay, Beth, Strawberry Shortcake and her friends, Danny Phantom, Sam Manson, Tucker Foley, Jazz Fenton, Danny, Sawyer, Jean-Bob, Speed, Puffin, Rex, Dweeb, Woog, Elsa, Rapunzel, Pascal, Flynn Rider, Maximus, Chanticleer, Wilbur the Albatross, Bob the Tomato, Larry the Cucumber, Junior Asparagus, Hercules, Megara, Philoctetes, Pegasus, Alice, Pocahontas, Meeko, Flit, Princess Aurora, Prince Phillip, Peter Pan, Tinkerbell, Rosetta, Silvermist, Idressa, Fawn, Oliver, Dodger, Lucky, Cadpig, Rolly, Spot the Chicken, Woody, Buzz Lightyear, Jessie, Tommy Pickles, Chuckie Finster, Simon, Theodore, Brittany, Huckle, Lowly, Woody Woodpecker, Ord, Cassie, Arthur Read Ash and his friends, Ronald McDonald and his friends, Bob the Tomato, Larry the Cucumber, Junior Asparagus, Laura Carrot, Jimmy and Jerry Gourd, Mr. Nezzer, Mr. Lunt, the Powerpuff Girls (Blossom, Bubbles, and Buttercup), Professor Utonium, Miss Keane, Blue the Puppy, Ploka Dots, Slippery Soap, Tickety Tock, Mr. Salt, Mrs. Pepper, Paprika, Periwinkle, Roar E. Saurus, Fredrica the Birthday Girl, Zazu, Rafiki, Kovu, Kiara, Terk, Tantor, the All-Grown Up Gang, Grandpa Lou Pickles, Carly Shay, Sam Puckett, Freddie Benson, Spencer Shay, Gibby, The Gummi Bears, Scrooge McDuck, Huey, Dewey, Louie, Webby, Launchpad McQuack, Darkwing Duck, Gosalyn Mallard, Honker Muddlefoot, Chip and Dale, Gadget Hackwrench, Monterey Jack, Zipper, Lilo, Stitch, Pleakey, Jumba, the Muppets (Kermit the Frog, Miss Piggy, Fozzie Bear, Gonzo, Bean Bunny, Rowlf the Dog, Scooter, Rizzo the Rat, Waldorf and Statler, Pepe the King Prawn, Sweetums, Thog, Sam the Eagle, the Electric Mayhem and Walter), Popeye, Olive Oyl, Popeye's Nephews (Peepeye, Poopeye, Pipeye, and Pupeye), Wimpy, Mario, Luigi, Princess Toadstool, Toad, Yoshi, Donkey Kong, Diddy Kong, Sonic the Hedgehog, Miles "Tails" Prower, Knuckles the Echidna, Amy Rose, Cream the Rabbit, Cheese the Chao, Shadow the Hedgehog, Rouge the Bat, Team Chaotix (Vector the Crocodile, Espio the Chameleon, and Charmy the Bee), Silver the Hedgehog, Blaze the Cat, Spyro the Dragon, Sparx the Dragonfly, Banjo and Kazooie, The Griffins (Peter, Lois, Chris, Meg, Brian, and Stewie), Glenn Quagmire, Cleveland Brown, The Teenage Mutant Ninja Turtles, Harry Potter, Hermoine Granger, Ron Weasley, Anastasia, Alex, Marty, Melman, Gloria, the Penguins of Madagascar (Skipper, Kowalski, Rico, and Private), King Julien, Maurice, Mort, Vitaly, Gia, Stefano, Marlene, Baloo, Bagheera, King Louie, Kit Cloudkicker, Rebecca Cunningham, the Vultures, Pinocchio, Jiminy Cricket, Geppetto, Woody, Buzz Lightyear, Jessie, Hamm, Slinky Dog, Rex, Mr. Potato Head, Mrs. Potato Head, the Squeeze Toy Aliens, Bullseye, Dolly, Mr. Pricklepants, Buttercup, Trixie, Chuckles the Clown, the Incredibles (Bob, Helen, Dash, Violet, Jack-Jack, and Frozone), Cinderella, Snow White, Ariel, Sebastian, Belle, Lumiere, Cogsworth, Mrs. Potts, Chip the Cup, Aladdin, Princess Jasmine, Genie, Abu, Mulan, Mushu, Cri-Kee, Pocahontas, Meeko, Flit, Princess Aurora, Princess Tiana, Louis, Rapunzel, Flynn Rider, Pascal, Maximus, Princess Merida, Peter Pan, Tinker Bell, Terence, Fawn, Rosetta, Silvermist, Iridessa, Vidia, Lucky, Cadpig, Rolly, Spot the Chicken, Alice, Hercules, Megara, Phlioctetes, Pegasus, Phineas and Ferb, Candace Flynn, Isabella Garcia-Shapiro, Stacy Hirano, Buford, Baljeet, Perry the Platypus, Kids World's Adventures Team, and the characters will guest star in this show.