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On the inevitable 104th day of vacation, the season is coming to a close and it’s Candace’s last chance to bust her brothers, who build huge playground equipment for the finale of summer. She is quickly foiled, but when she goes to return a DVD to Vanessa and finds Dr. Doofenshmirtz’s Do-Over-Inator, she finds an opportunity to redo the day, which results in other consequences like rips in the space-time continuum, the shortening of days, and the disappearance of her brothers.moreless
Eight years in the future, Phineas must decide between two colleges and learns that Isabella has liked him since they were kids. Ferb and the gang try to bring the two together so they will admit their feelings for each other. Meanwhile, Doofenshirmtz faces a midlife crisis.
After the Alternate Doofenshmirtz's defeat in the 2nd Dimension, a new threat emerges, leaving it up to that world's Phineas, Ferb, Candace and her resistance fighters to battle the new threat.