With power comes responsibility and witch Marnie Piper (Sara Paxton,Aquamarine) is about to learn that lesson first-hand as she enters Halloweentown's Witch University as a college freshman on a full scholarship.  Brother Dylan (Joey Zimmerman) accompanies her at their mother's (Judith Hoag) insistence and the two encounter old friend Ethan (Lucas Grabeel,High School MusicalandHigh School Musical 2) as well as Benny the Skeleton and a host of new characters.  Marnie is disappointed when she learns that there's a strict no magic policy on campus and soon discovers that she's been lured to Halloweentown to fulfill an age old prophecy that has little to do with college and everything to do with her ancestors and a secret that's been kept for a thousand years.  As Marnie struggles to discover who can be trusted and battles the incessantly devious Sinister Sisters (Kristy Wu, Katie Cockrell, and Kellie Cockrell), Marnie learns a lot about human (and inhuman) nature, Cromwell family history, her own strengths and weaknesses, and the responsibilities that accompany power.  Sara Paxton does a fine job replacing Kimberly Brown as Marnie, thoughHalloweentown, Halloweentown IIandHalloweentown Highfans are nonetheless apt to be somewhat disconcerted by the actress change.  The brief "Behind the Scenes Spooktacular" features interviews with the stars and a look at the movie's creatures and special effects. (Ages 5 and older)--Tami Horiuchi