User blog comment:AgentP/Phineas and Ferb movie/@comment-1758246-20100121051144

Danville is experiencing an extremely powerful earthquake caused by Doofenschmirts' Quake-Inator (His building is safe, the quake is going around it). Lawrence and Linda are safe in the mall, Candace is at Jeremy's house. Phineas, Ferb, Issabella, and Baljeet are all safe within the Flynn-Fletcher home. Suddenly the earthquake causes the house to break in half, separating the friends. Issabella and Phineas both get trapped on one side, Baljeet is hanging for his dear life, and Ferb is on the other side, attempting to save Baljeet. Phineas and Issabella end up falling into the hole, and get trapped (Inside Perry's Lair) by the debris. Perry must work his way through the earth quake, saving people and whatnot, then defeat Doofenschmirts. Perry's lair under the Flynn-Fletcher home is massively damaged, basically turning it into some kind of cave. Phineas and Issabella are trapped, and can't do anything to get out. They have a limited amount of air. During the time they are trapped, they will talk and get closer, as if its the end. Ferb and Baljeet must find Phineas and Issabella in the large pile of rubble. Blah, blah, blah, the movie goes on, Phineas and Issabella is saved. Doof is defeated and Perry destroys the Quake-Inator (Which destroys the top of the D.E.I building). Phineas gets hit on the head by debris and is knocked unconscious. In the end, Phineas wakes up at a makeshift hospital with no memory of what has happened. Lawrence, Linda, and Candace come to see if the kids are alright. Cue heartwarming family moment. Issabella is rather disappointed that Phineas doesn't remember anything, but decides to just go on with it. The credits would show Doofenschmirts digging his way out of the debris, looking around, then he'd start saying everything he did was a bad idea, and that he shouldn't go into large-scale destruction ever again. He kicks some debris out of the way and starts shoveling the debris to the side, in order to rebuild his home.

Some parts of the movie would focus on Buford, some parts on Candace and Jeremy, and some parts on Lawrence and Linda. The whole movie is basically Ferb trying to save Phineas and Issabella from the debris that had trapped them.