Orlando fandom fest MegaCon makes a return early next year with four days' worth  of all the celebrities, cosplay, comics and collectibles you've come to expect. Celebrity guests this year include Matt Smith (Doctor Who), Alicia Silverstone (Clueless), various luminaries from The Flash and Smallville, Christopher Mintz-Plasse (Superbad, Kick-Ass), Dolph Lundgren, as well as comics greats like Gabriele Dell’Otto, James Tynion — and the ever-obligatory many more.