The plot: Jim Starlin's early 90s sci-fi mega-epic puts arguably the Marvel Universe's most powerful weapon in the hands of a purple, scrotum-y chinned loony-toon. The Infinity Gauntlet holds six gems (known - shockingly - as the Infinity Gems), with each possessing the power of complete mastery over the multiverse (specifically - time, space, mind, soul, reality and power). Unfortunately for our heroes, Thanos is in love with Death herself, and decides to woo her by wiping out half the sentient life in the universe. Cue super-powered smackdowns.
The gabillion dollar setpiece: Every one of the Avengers unleashing their most powerful attack set at the same time, all the while a bejewelled mega-monster distorts time, space and reality to his will with a mere flick of the wrist. Chance of happening: 99%. Seeing as though we already saw Thanos sneering his way through The Avengers' post-credits scene, and we've already spied the Infinity Gauntlet glinting in the background of Odin's Trophy Room - guarded by The Destroyer - in Thor, it's all but a dead cert.