Now spanning six seasons and 60 episodes, with an average global viewership (from 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.