It's time for Westchester's biggest music festival: Lilapalooza! The Flaming Lips, Toadies and - of course - intergalactic superstar Lila Cheney are on the bill. And the X-Men are working security! But while the music is out of this world, so are our merry mutants when they end up lost in space! If they survive the Brood, the mighty Gladiator is here to save the day - oh no, wait, he's looking for a fight! Worse still, Apocalypse is back - and he's got big plans! How will the X-Men survive their deadliest enemy - and more important, how will they get back to Lilapalooza?! Plus: X-Factor '92! And Cyclops and Jean Grey...2099? Can everyone's favorite X-couple make their way back from the future? The animation-inspired adventures continue!