<Ul> <Li> Cayden Boyd as Max . An imaginative 10 - year - old boy , known as the `` day - dreamer '' on Planet Drool . `` At first he 's dreaming all for himself ; he wants Shark Boy and Lava Girl to take him away '' , says Boyd about the role . `` I like that he 's selfish in the beginning and he 's not selfish in the end '' . </Li> <Li> Taylor Lautner as Sharkboy . Lautner said about the character , `` He 's very self - confident and sometimes his confidence gets him into trouble . He 's also kinda jealous of the character , Max , because he has an inside crush on Lava Girl and she 's overly motherly to Max . '' Lautner 's martial arts skills helped him to obtain the role of Sharkboy . `` When I auditioned for the film , Robert Rodriguez , the director , did n't know that I had my martial arts ( background ) , and while we there in Austin , TX he saw a DVD of me and asked me to choreograph my own fight scenes '' , said Lautner . Lautner was the first to audition for the film , says Rodriguez , and was chosen immediately . </Li> <Li> Taylor Dooley as Lavagirl . The role was cast after the two other main characters , Sharkboy and Max , had already been cast . Her lava bike was computer - generated , like many of the elements in the film ; Dooley and Lautner described the on - set versions of the lava bike and Sharkboy 's shark - themed jetski as `` a green box with handles '' . </Li> <Li> David Arquette and Kristin Davis play Max 's parents . Max 's father is an unemployed writer . They are on the brink of a divorce . They mean well for Max but are unable to settle his troubles . On Planet Drool , Max 's parents appear as a pair of `` Cookie Giants , '' who live happily in the Land of Milk and Cookies . </Li> <Li> George Lopez as Mr. Electricidad , Mr. Electric , and the voices of Tobor and the Ice Guardian . Rodriguez states that he kept asking Lopez to play additional characters . Lopez spent a total of two weeks working on the film . </Li> <Li> Jacob Davich as Linus / Minus . He is a bully at Max 's school and steals his Dream Journal . With it , he enters Max 's dreamworld and , using the name `` Minus '' ( a nickname bestowed by Mr. Electricidad for Linus ' habit of disliked conduct ) , alters it to his version before ultimately befriending Max . </Li> <Li> Sasha Pieterse as Marissa Electricidad / Ice Princess . Marissa is the daughter of Mr. Electricidad , and at first the only student who befriends Max . On Planet Drool , she appears as the Ice Princess , keeper of the Crystal Heart , which is a necklace she wears which can freeze anything , including time . </Li> </Ul>
<Ul> <Li> Cayden Boyd as Max . An imaginative 10 - year - old boy , known as the `` day - dreamer '' on Planet Drool . `` At first he 's dreaming all for himself ; he wants Shark Boy and Lava Girl to take him away '' , says Boyd about the role . `` I like that he 's selfish in the beginning and he 's not selfish in the end '' . </Li> <Li> Taylor Lautner as Sharkboy . Lautner said about the character , `` He 's very self - confident and sometimes his confidence gets him into trouble . He 's also kinda jealous of the character , Max , because he has an inside crush on Lava Girl and she 's overly motherly to Max . '' Lautner 's martial arts skills helped him to obtain the role of Sharkboy . `` When I auditioned for the film , Robert Rodriguez , the director , did n't know that I had my martial arts ( background ) , and while we there in Austin , TX he saw a DVD of me and asked me to choreograph my own fight scenes '' , said Lautner . Lautner was the first to audition for the film , says Rodriguez , and was chosen immediately . </Li> <Li> Taylor Dooley as Lavagirl . The role was cast after the two other main characters , Sharkboy and Max , had already been cast . Her lava bike was computer - generated , like many of the elements in the film ; Dooley and Lautner described the on - set versions of the lava bike and Sharkboy 's shark - themed jetski as `` a green box with handles '' . </Li> <Li> David Arquette and Kristin Davis play Max 's parents . Max 's father is an unemployed writer . They are on the brink of a divorce . They mean well for Max but are unable to settle his troubles . On Planet Drool , Max 's parents appear as a pair of `` Cookie Giants , '' who live happily in the Land of Milk and Cookies . </Li> <Li> George Lopez as Mr. Electricidad , Mr. Electric , and the voices of Tobor and the Ice Guardian . Rodriguez states that he kept asking Lopez to play additional characters . Lopez spent a total of two weeks working on the film . </Li> <Li> Jacob Davich as Linus / Minus . He is a bully at Max 's school and steals his Dream Journal . With it , he enters Max 's dreamworld and , using the name `` Minus '' ( a nickname bestowed by Mr. Electricidad for Linus ' habit of disliked conduct ) , alters it to his version before ultimately befriending Max . </Li> <Li> Sasha Pieterse as Marissa Electricidad / Ice Princess . Marissa is the daughter of Mr. Electricidad , and at first the only student who befriends Max . On Planet Drool , she appears as the Ice Princess , keeper of the Crystal Heart , which is a necklace she wears which can freeze anything , including time . </Li> </Ul>
who plays the bully in sharkboy and lavagirl
who plays the bully in sharkboy and lavagirl
Jacob Davich
Jacob Davich