As revealed yesterday, Game of Thrones may be about to get it's first spin-off series.
Already a pilot for a new TV series, set 10,000 in the past, has been green-lighted by HBO for production.
But according to George R R Martin, this is merely one of five concepts that he's pitched - and while one has already been rejected, another three potential spin-off series remain on the discussion table:
George R R Martin said:Three more GAME OF THRONES prequels, set in different periods and featuring different characters and storylines, remain in active development. Everything I am told indicates that we could film at least one more pilot, and maybe more than one, in the years to come. We do have an entire world and tens of thousands of years of history to play with, after all. But this is television, so nothing is certain.
So, what could the other TV series be?
Well, GRRM already has two prequel series on the boil:
1. The Dunk and Egg novellas, now collected in a single edition published as A Knight of the Seven Kingdoms, is set 90 years before Game of Thrones,
2. Fire and Blood - to be released later this year - a new prequel story set 300 years before the start of Game of Thrones.
A third option would almost certainly be a sequel set some time after the events of Game of Thrones finishes, though this could either be a near future - with original actors reprising aged character roles - or else much later in the future, when such character names have become legends in their own right.
As for the prequel that is already signed-off, this is likely to air in 2020, and focus on the Age of Heroes, when the Children of the Forest faced the invasion of the First Men - a conflict that would eventually give rise to the White Walkers so infamous in the TV series.
The big question is whether Game of Thrones will work as a TV franchise - the original TV series had a pre-sold fan base, who could explain character and plot events from the books to new audience members. Any spin-off will not have familiar characters, only a somewhat familiar setting, so might be especially hard to pull off.
Still, Star Trek managed the same, but had a longer time to build up a fan base - so as to cover a wider audience demographic that covered multiple generations - plus a string of reasonably successful movies to support momentum, and continuation, into Star Trek: The Next Generation.
However, even Star Trek suffered from declining audience figures as it expanded into further spin-offs, such as Deep Space Nine, Voyager, and finally Enterprise - which was finally cancelled.
How does the future look for Westeros? Which ideas do you think HBO might go with? Are there any ideas you think I've missed? Feel free to post comments below.