Phineas and Ferb's Quantum Boogaloo Phineas and Ferb : Season 2 Episode 25

The boys travel into the future to borrow a tool, but when their future sister Candace finds what they are up to, she realizes that she has the evidence she needs to travel back into the past to bust her brothers. When she returns to her own time, she realizes that she has made a terrible mistake that only she can fix.