One of the biggest newer elements of Season 2 is the introduction of the concept of a Second Foundation and the mentalics to operate it. In the source material, this is the point where there's a notable change from the purely historical narrative format of the first Foundation. Things start to get convoluted, trippy, and hella confusing — and the show definitely follows suit.
By the end of the season, the re-resurrected Hari Seldon comes back from his supposed doom after being drowned and left for dead in a pool. Mentalics dictator Tellem Bond meets her gruesome fate at the hands of Seldon himself. However, before her consciousness truly fades, she manages to sabotage things from the grave by using one of her followers to assassinate Salvor Hardin. In the end, this leaves Tellem's freed followers to develop their mentalic skills for a century and a half while Gaal and Hari indirectly oversee them as god-like figures in cryosleep.
All of this may feel off-beat for a show like "Foundation." Season 1 had hints of mentalic activity, but it was mostly an "in the flesh" experience. However, the development of a Second Foundation is a critical part of Asimov's book series. It will play an absolutely vital role in fleshing out the rest of the story, not just with the Mule, but for the most critical crisis of all, one that still lies far in Humanity's future. However, we'll leave that spoilery stuff for another day.
Specifics aside, let's just say in the midst of a flashy, action-packed Season 2, some of the quietest developments with the mentalics may have the biggest payoffs down the road.
