James T. Kirk' old foe Khan escapes exile and steals the Genesis Device, a planet-terraforming tool that handily doubles as a superweapon. The Enterprise eventually blows up Khan' ship, but unluckily loses warp power just as Khan, with his dying breath, triggers a thermonuclear bomb. Spock fixes the warp drive just in time, but having stupidly not bothered to don any protective gear beyond a pair of gloves, dies of radiation poisoning. Kirk and a radiation-suit-wearing Scotty (ah, so that's what happened to it) watch safely from behind a plexiglass wall. Kirk's pretty broken up about it-not broken up enough to go in and help him, of course, but still.