When Matthew's crazy American cousin suddenly arrives on his doorstep, it's a bit shock for the whole family. Sam is small, blonde and wild - with a giant attitude problem - and he immediately starts to wreak havoc on Matthew's social life. Desperate to get their own back, Matthew and his best friends cook up a birlliant, outrageous plot that will humiliate Sam AND deal a stunning blow to the bitchiest girls at school. Victory is theirs until Operation Sam runs hysterically out of control...