This article is about the episode. For the characters, see Thaddeus and Thor (characters).
The Flynn-Fletcher's neighbors have relatives visiting who bear an uncanny resemblance to Candace, Phineas, and Ferb. In fact, older sister Mandy has two younger brothers, Thaddeus and Thor, who drive her crazy with their ambitious projects. Although Candace and Mandy initially bond, they soon compete, urging their brothers to build the best backyard fort. Meanwhile, Perry finds himself in the middle of Dr. Doofenshmirtz's family reunion where Dr. Doofenshmirtz tries to win the annual kickball tournament with the Kick-inator 5000.
Linda tells Candace that she'll be going out to buy some groceries. Candace overreacts and asks her if she's in charge of Phineas and Ferb, whereas Linda replies yes. Candace walks out into their backyard and tells Phineas and Ferb not to build anything today.
Candace walks away and spots Mandy, a visiting relative of Mrs. Weaver, the Flynn-Fletchers' neighbor. Mandy tells Candace about her brothers, Thaddeus and Thor, who constantly annoy her with their inventions, while Candace talks to her about Phineas and Ferb. The two soon argue about whose brothers are even more annoying. Thaddeus and Thor enter Phineas and Ferb's backyard and tell them that where they come from, they're known as "the best." Thaddeus tells Phineas and Ferb that they'll be building a backyard fort, and says to Thor that he knows who they're going to outdo today.
Candace finds out about Thaddeus and Thor's competition and tries to get Phineas and Ferb to build a backyard fort that's even greater than Thaddeus and Thor's so as to prove to Mandy that Phineas and Ferb really are better than Thaddeus and Thor. Soon Isabella is in on the action as Candace orders her to cover construction on their side with a tarp in response to Thaddeus and Thor doing so earlier. Meanwhile, Perry enters his lair and Major Monogram informs him that Dr. Doofenshmirtz has been sighted at Danville Park.
Perry rushes over there and sees Dr. Doofenshmirtz at his family reunion. Dr. Doofenshmirtz tells Perry about a time in his life when his mother's love was inexplicably linked to kickball, and his brother Roger always outshone him.
Dr. Doofenshmirtz shows Perry his new invention, the Kick-inator 5000. He tries to get test it out with Perry but tells him it's in the process when it accidentally kicks him in the face. He tries everything from adjusting the position of the ball to swinging it on a string. Finally, after many attempts, he kicks the ball.
Candace realizes that Linda has arrived in the driveway. She tells her mom that she forgot "that stuff," causing her to drive back to the grocery store while Candace is left to deal with the competition. Thaddeus and Thor reveal their fort, which has a slide and licorice dispenser.
Candace reveals Phineas and Ferb's fort, which turns out to look just like a regular fort. Candace feels disappointed and walks out. However, Ferb presses a button and their real fort grows out of the ground, which turns out to be nearly fifty feet tall, complete with a bowling alley and a swimming pool. Thaddeus and Thor look impressed as Phineas and Ferb outshine them.
Meanwhile, Dr. Doofenshmirtz kicks the ball so far, it bounces off Phineas and Ferb's fort. As Heinz stands feet from home, gloating to his brother Roger, the ball comes back. Roger catches it and tags Dr. Doofenshmirtz out, which impresses their mother and leaves Heinz sitting in the dirt to be comforted by Perry. Mandy leaves with Thaddeus and Thor in embarrassment. She tells Candace that Phineas and Ferb are really the best, and Candace goes outside to see their real fort. Ferb deactivates the fort (due to zoning regulations) and it sinks right into the ground just as Candace and Linda arrive outside. Linda, who can only see the ordinary fort level, says that it's "great that they've started to take an interest in building things". Candace faints.
- Vincent Martella as Phineas
- Ashley Tisdale as Candace
- Thomas Sangster as Ferb
- Alyson Stoner as Isabella
- Caroline Rhea as Mom
- Dan Povenmire as Heinz Doofenshmirtz
- Jeff "Swampy" Marsh as Major Monogram
- Dee Bradley Baker as Perry
- Allison Janney as Charlene Doofenshmirtz
- Olivia Olson as Vanessa Doofenshmirtz
- Cloris Leachman as Heinz Doofenshmirtz's mother
- John O'Hurley as Roger Doofenshmirtz
- Jaret Reddick as Danny
- Danny Cooksey as Thaddeus
- Aliki Theofilopoulos as Mandy
- When Phineas and Ferb unveil the rest of their fort, the Fireside Girls are seen in the crowd but some of them were seen in two different places at once.
- When Doofenshmirtz starts to play the song Couldn't Kick My Way Into Her Heart, he appears to be playing the balalaika. But in "Mom's Birthday", he claims to hate all instruments that start with the letter "B." Balalaika is one of the instruments that was shrunken in that episode.
- When Phineas and Ferb give Thaddeus and Thor the tour of the fort, they say that they have a scoring stage with a 40 piece orchestra, but there are only 37 people with instruments.
- Closed Captioning has Gimmelshtump misspelled "Kimmelstump" and "Kimmelstock".
- The second time Linda came home, she should've seen the fort from the front yard.
- When Candace literally throws the groceries into the kitchen, she throws them in the bags, but when Linda sees the mess only the groceries are on the floor and the bags are nowhere to be seen.
- Though taking part in a flashback showing Heinz Doofenshmirtz when he was young, the members of Love Händel are the same age as they appeared at their reunion concert and in the same clothing.
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