The Adventures of Shark Boy & Lava Girl (2005)

Max is a 10-year-old outcast who escapes his lonely world when his dreams magically come to life. Shunned by his classmates and forced to spend his summer vacation alone, Max and his two imaginary friends, Shark Boy and Lava Girl, embark on a mission to prove to the world that all it takes is a dream to make anything a reality.

Official website: http://www.sonypictures.com.au/movies/sharkboylavagirl/site/