Now spanning six seasons and 60 episodes, with an average global viewership (from its most recent season) of 25.1 million viewers per episode (Shepherd, 2016), it has spawned five video games, a graphic novel adaptation, several companion books, two rap albums, a 28 - city orchestral tour, a wide variety of tabletop games, toys, merchandise and mobile apps, and countless podcasts, fanfics and other fan - based creations.