Disney Channel Original Movie Girl Vs. Monster has assembled its cast. The film stars Olivia Holt as a teen girl who on the eve of Halloween, discovers that she’s a fifth generation monster hunter but before she begin her family’s true calling, the monsters will try to stop her. Joining her in the cast are Jennifer Aspen (GCB) and Brian Palermo (The Social Network) as the her parents, as well as Brendan Meyer (Disney XD’s Mr. Young), Kerris Dorsey (Moneyball), Katherine McNamara (New Years Eve), Luke Benward (Disney Channel’s Minutemen), Tracy Dawson (Call Me Fitz) and Adam Chambers (Good Luck Charlie). Stuart Gillard will direct from a script by Annie DeYoung, Ron McGee and Geoff Rodkey. Sheri Singer is executive producing. The movie is slated to premiere in the fall, during the second annual month-long Monstober event. In addition to her co-starring role on the new ABC dramedy GCB, Aspen will guest star on the April 22 episode of NBC’s Harry’s Law. Palermo is with Schachter Entertainment and GVA.