And now, with a new trailer for the fast-approaching Foundation Season 3, one of the biggest and boldest changes from the books looks to be utterly justified. Roughly, this means that Foundation Season 3 will be drawing on elements from the latter half of the second book, Foundation and Empire, and much of the third book, Second Foundation. But, unlike the books, what the TV series has done is plant a counter for the Mule in the form of Gaal Dornick (Lou Llobell). So, what the TV series has done by making Gaal a powerful mentalic is set her up as the foil for the Mule. Foundation Season 3 hits Apple TV+ on July 11, 2025.