Ella Purnell as Lucy MacLean in "Fallout."Amazon Prime VideoAmazon's "Fallout" is based on Bethesda Softworks' post-apocalyptic video game series.It takes place in an alternate world, where nuclear technology is used for everything.The cast include actors from "Yellowjackets" and "The Hateful Eight."The "Fallout" video games have gripped players since the late '90s and the franchise is finally getting the live-action treatment from Amazon.