Phineas and Ferb travel to the future to find a tool that fuses metal with wood. There they encounter a 35-year old Candace who follows them back through time and finally busts her brothers as they are building their rollercoaster, but also accidentally foils Agent P's plan to defeat Dr. Doofenshmirtz, setting off a chain reaction that turns the future into a dystopian society.
Phineas and Ferb's Quantum Boogaloo Gallery
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"Phineas and Ferb Musical Cliptastic Countdown"