Rudy gets grounded for bad grades because of spending too much time with his chalk drawing...on the day of his favorite glam metal band's concert and Rudy realizes that he is going to miss the concert, so he decides to sneak out by traveling through ChalkZone in order to get to the concert on time so he can meet up with Penny. / Snap learns about his family background. / Three knights require Snap's help to retrieve their Holy Grail.