Last Day of Summer

"Last Day of Summer" is the upcoming hour-length series finale to Phineas and Ferb. It is scheduled to premiere simultaneously on the Disney Channel and Disney XD on June 12, 2015, following a 72-hour marathon of all the previous episodes of the series.

Summary
The summer season is coming to a close and it’s Candace’s last chance to bust her brothers. She is quickly foiled, but is presented with an opportunity to redo the day when she sets off Dr. Doofenshmirtz’s Do-Over-Inator, which results in other consequences like rips in the space-time continuum, the shortening of days and the disappearance of her brothers.