Now that the DC Universe is underway thanks to the release of Creature Commandos Season 1 to Max subscription holders (and yes, Season 2 is on the way), the next step for this franchise is to release its first movie.

The estate of Superman co-creator Joe Shuster sued DC Comics and Warner Bros. on Friday, seeking to invalidate the companies’ copyrights in several foreign markets. The suit revives a long-running dispute that was last addressed by the 9th Circuit Court of Appeal in 2013.

The upcoming Superman movie by filmmaker James Gunn is being sued by the Superman estate to block it from being released in key territories.