Star Treks famous Prime Directive holds that the crew of the U.S.S. Enterprise must neverinterfere witha developing planet and its scientific and cultural evolution.The Prime DirectiveforStar Trekfans: Love the even-numbered films, hate the odd-numbered ones.At least that was always the belief amongStar Trekfans back in the day. The even films, likeStar Trek II: The Wrath of Khan, were good. The odd films, likeStar Trek V: The Final Frontier, werebad.Exceptthe even ones werent always that great. And the odd ones were sometimes sneakily satisfying. (Related: My Star Trek: The Motion Picture Is Good, Actually T-shirthas people asking a lot of questionsalready answered bymy shirt.) And once the films featuring the originalTrekcast gave way to the ones featuring the stars ofThe Next Generationand then a whole new cast in a new timeline assumed the roles of Captain Kirk, Mr. Spock, and the rest of the Enterpriseteam all the old numbering rules went out the airlock.So what trulyare the worstStar Trek movies? To find that out, you cant justglance atthe Roman numeralsin the subtitle. Youve got to watch and think about them; learn what theyre about (or, more troublingly, recognize whentheyre not about much of anything). WhileStar Trek has produced some very enjoyable cinematic voyages, these five ranked from almost okay to akin to torture at the hands of the Vians fromthe O.G.Trek episode The Empath leave a lot to be desired.The Worst Star Trek MoviesWe love Star Trek, and most of the Trek films produced over the last 40+ years. These, however, were not series highlights. READ MORE: Get our free mobile app80s Movies That Could Never Be Made Today