Sixth-grader Brad makes the mistake of drawing instead of paying attention in class. When Brad's parents ground him from drawing, his bratty little brother Daley rubs it in. Later that night, Brad is surprised when a mysterious crow delivers a pen to his bedroom window. Missing his beloved drawing and frustrated with his brother, Brad uses the pen to draw a Daley-Destroyer, a giant slimy green creature that he envisions "getting" Daley. To Brad's surprise, the pen is a magic pen, and the Daley-Destroyer comes to life, just as he imagined it, slime and all, and starts going after Daley To makes things worse, only he and Daley can see it Can Brad erase his monster problem before it's too late?