Isaac Asimov wrote a lot of sci-fi novels, and Foundation manages to reference a lot of the author's work with the presence of a single character.

Foundation is an adaptation of the seminal sci-fi series by author Isaac Asimov, and it lives up to the scale of its source material. Season 2 garnered even more critical acclaim than the show’s ...

Apple TV+ will debut “Foundation,” the first-ever screen adaptation of Isaac Asimov’s bestselling, award-winning science-fiction book series. First announced in 2018 and produced in ...

and she’s based on a character well outside of the “trilogy.” This is all to say there’s plenty of material for Foundation to continue beyond Season 3, and into Season 4 and beyond.