By Alexa Hyland Monday, May 31, 2010 Monsters are coming to the house that Barbie built. Mattel Inc. is unveiling its Monster High franchise this summer, the first in-house toy brand the company has launched since Hot Wheels in 1968, featuring characters based on teen children of werewolves, zombies and other frightmeisters. It will also be the biggest brand launch in the company’s history because the dolls will be accompanied by an apparel line, a series of books, an interactive website and webisodes, and Halloween costumes this fall. A movie is expected in 2011 or 2012. Guys and ghouls