Magnum Opus Con (MOC) was an annual multigenre convention which generally took place each spring in various cities in the U.S. states of Georgia and South Carolina from 1986 to 2001. Organized by comics retailer Roland Castle, the convention was designed to attract science fiction fans of all stripes. Over its 16-year run, MOC featured hundreds of celebrity guests and ran hundreds of hours of programming for fans of science fiction, fantasy, comic books, gaming, and other elements of fandom.