Cult following
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A cult following is a group of fans devoted to a specific item, usually a film, television or radio program, though some comic books, musicians, writers or others also gain dedicated followings.
These dedicated followings are usually relatively small and pertain to items that don't have broad mainstream appeal, though there are exceptions, mostly in science fiction. Cult followings are often dedicated enough that many of the people in them have at least heard of each other due to their meeting at conventions, concerts, internet chat rooms or shops featuring the item in question.
An example of a usual cult following would be the followers of the Ogre Battle series of video games. An exception to the usual cult following rules is Star Trek, whose followers call themselves Trekkies. Star Trek has an extremely large following but can still be considered 'cult'. Science-fiction oriented cult followings include that of The Hitchhiker's Guide to the Galaxy.