As for the game's lore for why he's here:
Quote:
A wormhole has opened in Skylands and the great Aku Aku appears! He has come to announce the once-in-two-decades Synchronization Celebration--a time when all of the worlds align perfectly. All the inhabitants of Wumpa Island are having a party and they want to invite the Skylanders. But with Kaos on a quest to take over Skylands using his army of Doomlanders, the Skylanders must focus on stopping his evil plans. Never one to shy away from danger, the legendary marsupial Crash Bandicoot leaps through the wormhole to join the Skylanders in the ultimate battle against Kaos!
He will be available in special PlayStation 3 and PlayStation 4 Starter Packs but the character will be playable on all consoles, he will not be restricted like Bowser and Donkey Kong last year.
And that's not all for the long dormant character, they'll also be remastering the first three PS1 Crash Bandicoot games for PS4.