Taylor Lautner as Sharkboy
Taylor Dooley as Lavagirl
David Arquette as Max's Dad
David Arquette as Max's Dad
Kristin Davis as Max's Mom
Kristin Davis as Max's Mom
Jacob Davich as Minus (Voice)
Rico Torres as Sharkboy's Dad
Marc Musso as Classroom Kid #1
Shane Graham as Classroom Kid #2
Tiger Darrow as Classroom Kid #3
Racer Rodriguez as Sharkboy (Age 7)
Rebel Rodriguez as Sharkboy (Age 5)
Joshua Burniece as Mr. Electric's Son
Chloe Chung as Classroom Kid
Mackenzie Fitzgerald as Playground Kid
Araceli González as Principal
Anthony Guajardo as Classroom Kid
Tania Haddad as Classroom Kid
Peyton Hayslip as Teacher
Jordan Levy as Nate Higgers
Spencer Scott as Playground Bully