Help! I'm a Fish

Help! I'm a Fish is a 2000 Danish animated musical science fantasy film directed by Stefan Fjeldmark, Greg Manwaring, and Michael Hegner, and written by Fjeldmark, Karsten Kiilerich, John Stefan Olsen, and Tracy J. Brown. It stars the voices of Alan Rickman, Terry Jones, and a then-unknown Aaron Paul. The film tells the story of three kids–Fly, his little sister Stella, and cousin Chuck–who turn into sea creatures and must return to human form before 48 hours are up; otherwise, they will be stuck as fish forever. They must also contend with a pilot fish who has taken the antidote for himself, which he has his own plans for.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.