Beyond Fallout: 18 Best Sci-Fi Series on Prime Video Ranked "Finished Fallout Season 2? Discover the 18 best sci-fi series on Prime Video you need to stream next. From mind-bending hits like Secret Level and The Boys to hidden gems from 2005–2025, we’ve ranked the ultimate sci-fi watchlist for 2026. Don't miss these must-watch masterpieces." ...