David Arquette and Kristin Davis have signed up for Robert Rodriguez's
The Adventures of Shark Boy and Lava Girl in 3-D, according to the Hollywood Reporter.
The story tells the tale about a 10-year-old outcast shunned by classmates and forced to spend summer vacation alone. With his two imaginary friends -- the title characters -- he goes on a mission to prove that dreams can become reality. Arquette and Davis play the boy's parents.
Other stars signed up include Taylor Dooley, Taylor Lautner, Cayden Boyd and George Lopez.