George R.R. Martin working on new TV series with HBO

George R.R. Martin, the writer of the Song of Ice and Fire novels that HBO's Game of Thrones is based on, is developing a second television series with the network, report Entertainment Weekly and The Hollywood Reporter.

Called Captain Cosmos, the show focuses on a young science fiction writer living in 1949 — "the dawn of the age of TV," the pitch notes — who dares to tell stories that others shy away from. Michael Cassutt, a writer and co-executive producer on Syfy's Z Nation, is writing the pilot.

If Captain Cosmos does go into production, it's not expected to take up too much of Martin's time, according to Entertainment Weekly and The Hollywood Reporter. Last month, Martin announced that he was canceling a previously scheduled appearance and wouldn't be attending Comic-Con International in San Diego this year. Instead, he's focused on finishing The Winds of Winter, the sixth entry in A Song of Ice and Fire — perhaps this year.

Martin released a new chapter from the novel, one from Sansa Stark's perspective, in late March. The previous book, A Dance With Dragons, was published in 2011. The fifth season of Game of Thrones premieres April 12 at 9 p.m. ET on HBO.