Phineas and Ferb the Movie: Candace Against the Universe

Phineas and Ferb travel across the galaxy to rescue their older sister Candace, who has been abducted by aliens and taken to a utopia in a far-off planet. They recruit their friends Isabella, Baljeet, and Buford to build a portal to the planet, and join forces with Dr. Doofenshmirtz to reach Candace. Candace meets leader Super Super Big Doctor, who sympathizes with her and reveals that she contains "Remarkalonium", a substance that is important for the people of Feebla-Oot. As Candace tries to adjust to her new life, she learns that she may not be special to the world, but she is special to her brothers.