The Romulans are a fictional extraterrestrial humanoid species in the science fiction franchise Star Trek. First appearing in the original Star Trek series in the 1966 episode "Balance of Terror", they have since made appearances in all the main later Star Trek series: The Animated Series, The Next Generation, Deep Space Nine, Voyager and Enterprise. In addition, they have appeared in various spin-off media, and prominently in the two films Star Trek: Nemesis (2002) and Star Trek (2009).