They're gonna Gandolf his ass!
He starts off by staring down some bad ass monster (Balrog/Palpatine respectively), ends up falling down a bottomless pit against said monster, presumably fight with monster on the way down during the opening credits, and becomes Vader the White! He then comes back to help his Ewok friends (as well as the Fellowship; Aragorn/Han Solo; Legalos/Princess Leia; Boromir/Luke Skywalker and Gimli/Yoda) get the washer that will fix the Death Star into the fires of Mustafar!
He starts off by staring down some bad ass monster (Balrog/Palpatine respectively), ends up falling down a bottomless pit against said monster, presumably fight with monster on the way down during the opening credits, and becomes Vader the White! He then comes back to help his Ewok friends (as well as the Fellowship; Aragorn/Han Solo; Legalos/Princess Leia; Boromir/Luke Skywalker and Gimli/Yoda) get the washer that will fix the Death Star into the fires of Mustafar!