Former Infinity Ward heads Vince Zampella and Jason West have added Fraud charges to their lawsuit against their former bosses at Activision, reports GameSpot, who say they have seen the amended legal filings (thanks Big Download). At issue is a Memorandum of Understanding which offered them more autonomy, though they were skeptical this could be circumvented by firing them. They claim they signed this after being told by Activision CEO Bobby Kotick, "Don’t worry about it. It’s impossible for you guys to get fired." Here's more:

"While paying lip-service to West’s and Zampella’s creative authority, in 2008 and thereafter, Activision began secret development of Modern Warfare and Call of Duty games and related products, and undertook other conduct in relation to these two videogame franchises that, under the MOU, required prior approval from West and Zampella," the amended complaint reads. "Activision did not inform West or Zampella of such plans or seek their input or approval for them. Indeed, while breaching the creative authority provisions of the MOU, Activision continued to pay lip-service to them, in an attempt to mask its secret development efforts."

Speaking to GameSpot, a lawyer representing West and Zampella indicated that in addition to actual and punitive damages, the two are seeking a rescission of the MOU. If granted, Activision would co-own the Modern Warfare brand with Vince and Zampella, which would give the two the right to release their own copies of the game. A voided contract would also give West and Zampella the right to create new games in the Modern Warfare franchise, he said.