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Super Fans Header from Issue #2.
Super Fans Header from Issue #15.
The designation 'Super Fans' was first utilized in the original Super Friends comic book series, in the fan letter section of the comics.
Super Fans are fans of the Super Friends and related material, such as the Super Friends comic book and other shows that are related to it.
The term is similar to trekkie, (also called Trekker) which is used to describe any fan of Star Trek. Of course the term Super Fan isn't nearly as popular as Trekkie is though.