'Foundation' Creator David S. Goyer on Those Season 3 Finale Twists and Why He's Leaving the Show

Note: The following contains spoilers from the "Foundation" Season 3 finale. Fans of "Foundation" should know by now to expect a twist or two in every season finale, but the Season 3 finale – titled "The Darkness" – included several shocking plot developments that left viewers wondering how this show could possibly continue. Instead of dying like he was supposed to, Brother Dusk (Terrence Mann) went on a rampage. He killed all the Empire clones, then he killed Demerzel (Laura Birn) who was finally within reach of being free, and he then killed Brother Day (Lee Pace). The last . . .