Warner Bros is being sued for the alleged unauthorised use of two cats that have achieved internet fame.
The complaint alleged that the cats were used without permission in Scribblenauts, a series of games on the Nintendo DS and other platforms.
Neither Warner Bros or 5th Cell, the game's developer, have commented.
Court documents alleged that Warner Bros and 5th Cell "knowingly and intentionally infringed" both claimant's ownership rights.
"Compounding their infringements," court papers said, "defendants have used 'Nyan Cat' and 'Keyboard Cat', even identifying them by name, to promote and market their games, all without plaintiffs' permission and without any compensation to plaintiffs."
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