Phineas and Ferb the Movie: Candace Against the Universe is a 2020 American animated musical science fiction comedy film based on the animated television series Phineas and Ferb, created by Dan Povenmire and Jeff "Swampy" Marsh. Directed by Bob Bowen, who co-wrote it with Povenmire, Marsh, and several other writers, it is the second film based on the series following Across the 2nd Dimension (2011). Set at some point during the summer depicted in the series and before the series finale, "Last Day of Summer", the film follows Phineas and Ferb as they rescue their sister Candace and Dr. Doofenshmirtz's daughter Vanessa from the planet Feebla-Oot. However, Candace becomes tempted to stay on the planet when she is treated with respect by its people, not knowing that they harbor a dark secret which involves her presence.

While developing Disney+, Disney approached Povenmire and Marsh for a new Phineas and Ferb film. The film began work at Disney Television Animation, but was continued remotely from home due to the COVID-19 pandemic. The entire Phineas and Ferb cast reprise their roles from the series and the previous film, with the exception of Thomas Brodie-Sangster, the original voice of Ferb, who is replaced by David Errigo Jr.; much of the film's dialogue was recorded remotely. Danny Jacob returned to compose the score as with the series and the previous film; as with the voice acting, music was recorded remotely.

Produced by Disney Television Animation, Phineas and Ferb the Movie: Candace Against the Universe was released on Disney+ on August 28, 2020. The film received positive reviews from critics, with praise for its story, voice acting, humor, animation, character development, and music.