Afraid you'll be confused when George R.R. Martin's rich, complex fantasy series A Song of Ice and Fire comes to television as Game of Thrones? Don't worry. HBO is watching out for you.
In a dramatic new preview, Martin and the series' stars explain the geography, family history and political dynamics of the Seven Kingdoms of Westeros clearly enough that it'll all make sense, even if you've never read the novels.
Get up to speed with the tutorial below, which includes never-before-seen footage.