MGA Entertainment is accusing rival Mattel of spying on other toy companies and stealing trade secrets as the legal battle over the future of the Bratz doll line continues.
MGA says in a counterclaim that Mattel has used fake name badges to slip into the showrooms of its competitors at various international trade shows.
Mattel says the allegations are false.
A federal jury awarded Mattel $100 million in 2008 and granted the firm ownership of the Bratz dolls.
A federal appeals court overturned that ruling last month and the case is set to be retried in January.