Last week, Netflix finally revealed the core cast of its upcoming television series based on The Sandman, the beloved DC Comics series written by Neil Gaiman. However, this isn't the first television series on Netflix that's built on The Sandman. Lucifer, starring Tom Ellis, is inspired by the version of Lucifer that Gaiman and artists Sam Kieth and Mike Dringenberg created for Sandman, who eventually got his own Vertigo Comics spinoff series. Knowing that, and knowing that Netflix is the home of both Sandman and Lucifer, some fans wonder why Gwendoline Christie is playing Lucifer in Sandman instead of having Ellis reprise his role as the Morningstar. Gaiman explained while responding to a fan's question about that on Tumblr.