What happens in the Foundation season 3 finaleLee Pace in "Foundation," now streaming on Apple TV+. Brother Dusk is being turned into Brother Darkness, the day of his death seemingly inevitable. Also, I simply have to comment on Dusk singing his way through the murder of his brothers and of Day. Then there’s the other main storyline of the episode, which, of course, deals with the inevitable showdown between Gaal and the Mule. Episode Grade: A-Foundation has been renewed for season 4.