When Brian K. Vaughan teamed his wildly original vision for an epic space opera/fantasy comic book with the equally bewitching artwork of Fiona Staples , a classic was born. The duo's hugely acclaimed Saga series has been picking up awards since its 2012 launch, so it's no surprise Volume 4 just won the best graphic novels and comics category in this year's Goodreads Choice Awards. Likened to everything fromand Game of Thrones to Romeo and Juliet and the New Testament, Saga deploys both out-there sci-fi/fantasy (trees as rocket ships, characters with televisions for heads, a talking cat) and authentic human storytelling—in essence it's the journey of new parents battling to raise a child in a warring, hostile world.The hit adult series, often praised for its humor and inventiveness, grew out of a fictional universe Vaughan invented as a kid as well as his experiences of becoming a parent. Here Vaughan and Staples share five of their favorite books with stellar worldbuilding.