Ella Purnell chats with ET about starring in 'Fallout,' premiering April 10 on Amazon Prime. Pop open the Nuka-Cola, sit back and relax, because you can watch the new 'Fallout' series early.

If Leslie Knope lived in a post-apocalyptic wasteland, she might look something like Ella Purnell’s Lucy ... the Pip-Boys, the Nuka-Cola, the Radroach, there’s so much.