Although Paramount Pictures and CBS have long tolerated fan-produced "Star Trek" short films and webseries, including "Star Trek: New Voyages" and "Star Trek Continues," a crowdfunded movie prequel appears to be a bridge too far.

According to The Hollywood Reporter, the companies filed a lawsuit last week to put a stop to "Axanar," billed by its producers as the "first fully-professional, independent 'Star Trek' film." The Indiegogo campaign raised more than half a million dollars.

Accusing the producers of copyright infringement, Paramount and CBS are seeking an injunction and damages.

"Axanar" takes place 21 years before the events of "Where No Man Has Gone Before," the second pilot of the classic "Star Trek" series, which introduced William Shatner as James T. Kirk. The film is described as the story of legendary Starfleet captain Garth of Izar and his crew during the Four Years War between the Klingon Empire and the Federation.

Paramount will release its own movie sequel, "Star Trek Beyond," on July 22. CBS is also plotting a television revival that will stream on its CBS All Access digital subscription service.