Sigh...OK...where to begin with this one? The very title gives me the idea this episode will be about a massive battle between Finn and Flame Princess. And FP dies or becomes Finn's nemesis.
But it could also be something hilarious, like Ice King trying to find a new nemesis since he and Finn are so chill now.
Or it's Lich-related. As in evil baby Lich-related.
Or, it could even continue the events of "Something Big" by showing us what the Ancient Psychic Tandem War Elephant is doing with Maja (that'd be hilarious).
Either way, with a title like "Nemesis", something big is bound to happen.
Discuss below (no flames; new policy).