Having found massive success with Game of Thrones, the HBO fantasy epic that premieres its fifth season on April 12, writer George R.R. Martin is looking to expand his TV fortunes.

The Game of Thrones author, who has an overall deal with HBO, is on board as a producer for a science fiction period drama with the pay cabler, a move first reported by Entertainment Weekly.

The series is tentatively called Captain Cosmos and centers on a young science fiction writer in 1949, at the dawn of the TV age. Z Nation coexecutive producer Michael Cassutt is writing the series, which is in the early stages of development.

Read more at broadcastingcable.com.