Star Trek is full of heroes – principled idealists like James T. Kirk, Jean-Luc Picard, Spock and Will Riker. But Starfleet just wouldn't be the same without some bad guys to keep things interesting. Over the course of five TV series and 12 big-screen adventures, viewers have shivered at the sight of all kinds of freaky aliens, warlords, interdimensional beings and garden-variety psychopaths. With Star Trek: Into Darkness hitting theaters this weekend, we went back and counted down the franchise's top 10 villains of all time. Read on to see where your favorites ranked.