Part summary : Phineas and Ferb are sitting under a tree, wondering what to do. Phineas realizes that they will be back in school shortly and they will have to say what they did over their summer vacation. He feels that their time off should be exciting, like a rollercoaster. Remembering the lame coaster they rode at the State Fair, Phineas realizes that's what they should do today: build a rollercoaster. As their mom, Linda, heads off to do some shopping, Candace runs to her car to confirm that she's been put in charge. Mom doesn't think it's necessary that anyone be in charge, but Candace does. "What if a satellite falls out of orbit and crashes into the house?" It's not likely to happen, so her mom gives her approval and Candace rushes over to tell the boys, "Mom says I'm in charge! ...Conditionally!" That doesn't bother Phineas. He and Ferb have set up drafting tables and have started working on their "homework". Candace doesn't understand why they would be doing homework during their summer vacation. She heads into the house after admonishing them that they are being watched, and reminds the boys that she's in charge, conditionally. Candace only gets to take one look out the window before the phone rings. It's Stacy, wanting to go to the mall with her. She can't go because she has to watch her brothers. Candace makes sure that Stacy will see if Jeremy is there. While Candace been talking on the phone, the boys and Perry have been transporting various building ...

Summary part: Phineas and Ferb are sitting under a tree, wondering what to do. Phineas realizes that once again for a short time in school, and they have to say what are their summer holidays. He feels that their free time should be exciting, like a roller coaster. In memory of the mountains to the lame man who led the State Fair, Phineas realized that is what we should do today, the construction of a roller coaster. When his mother, Linda, head off to go shopping, Candace runs to her car to confirmthat those responsible have been set. Mom did not think I need someone to load, but Candace. "What happens when a satellite falls out of orbit and crashes into the house?" Not likely, so her mother gives her consent and Candace rushes to tell the boy: "Mommy says I'm the leader because ..." This worries Phineas. He and Ferb have set the drawing boards and started their "homework". Candace does not understand why they are doing homeworkduring the summer holidays. He runs into the house after warning that they are being watched, and reminded the boys that are in office, conditionally. Candace will only take a look out the window before the phone rings. This is Stacy and she wanted to go to the mall with her. You can not go because he saw his brothers. Candace ensures that Stacy will see if there's Jeremy. While Candace talked on the phone, are the boys and Perry was carrying several building...