Season 3: The Rings of Men make it to the hands of 9 men. Chaos ensues.

Season 4: Sauron creates the One Ring. Darkness prevails.

Season 5: Harfoots settle in the Shire area? Elves and Men unite to fight against Sauron. Sauron loses his hand (and ring).

I am not a Tolkien expert I just really enjoy the movies.

What other events do you think will happen in the series?