Alien invasion on the island.
Sunbeam, fascinated by space, makes the mistake of contacting a flying saucer and inviting hostile world invading aliens on Earth.

This episode is the only one that has an ending which may feel like an ending to the whole game, because it is. Or was. Episode 7 was the final base episode of the original game, and the last three episodes after this are DLC. Yes, I bought the DLC episodes to Naughty Bear, what of it?! I think they're fun.