Disney’s upcoming film, the sure-to-be masterpiece “John Carter,” is based on Edgar Rice Burroughs’ character John Carter of Mars, an antebellum Southern gentleman who is transplanted to—you guessed it—Mars.

Edgar Rice Burroughs Inc. (ERB), the company that owns Burroughs’ trademarks, is suing comic book distributor Dynamic Forces and its publisher Dynamite Entertainment over books based on the rugged alien-befriender, as well as Burroughs’ other famous character Tarzan.

ERB claims the comic book series “Lord of the Jungle” and “Warlord of Mars” infringe its trademarks, and it accuses Dynamic and Dynamite of unfair competition. Dynamic and Dynamite claim they sought permission from ERB to publish the comics, but ERB claims it never granted it.

Read more in the Wall Street Journal.