Having only run for one season back in 2002, against all odds, Firefly became a cult-classic TV series, and remains beloved over 20 years since it first came out. With Firefly's stellar cast that features Nathan Fillion, Gina Torres, Alan Tudyk, Morena Baccarin, and more, the show had a lot going for it, especially with Joss Whedon at the helm, coming off the creation of Buffy the Vampire Slayer, arguably the best supernatural teen drama of all time.