Mattel Inc. has filed a lawsuit against Van Nuys toymaker MGA Entertainment Inc. alleging the company stole its concept for the popular Bratz doll line. The complaint, filed Monday in U.S. District Court in Riverside, expands a lawsuit filed in 2004 in which El Segundo-based Mattel alleged one of its former doll designers sold the concept of Bratz to MGA. The new suit contends MGA hired away key Mattel personnel and used intellectual property theft to fuel the growth of the company. The popular Bratz line first hit store shelves in 2001. Calls to MGA were not immediately returned.
