Phineas and Ferb the Movie: Candace Against the Universe

Phineas and Ferb know exactly what they are going to do today: rescue their older sister. When Candace is abducted by aliens and taken across the galaxy to a distant planet, the famed stepbrother inventors set out to bring her home. But Candace finds herself in a seeming utopia far from Earth, and, for once, free of her pesky little brothers.