What is the difference between an independent production and a fan film? The difference is, who owns it? Polaris is owned by the people who made it. Space adventures are a group of stories not all of which are owned by the same person. If the Polaris people want to sell me a DVD of their movie for $12, they can sell it, I can buy it, and Paramount, Warner Communications, Disney, CBS, and whoever else owns a space franchise has nothing to complain about. James Cawley and I can't make the same deal about World Enough And Time. Granted, there are parodies which can be 'fair use' exceptions and which may be sold, and are also fan films. But the key word is exception.
Polaris is playing in their own playground, not Paramounts'.