According to reports, 3,500 fans turned up in Spanish cities Tudela and Girona to audition for a part as an extra.
The cast of Game of Thrones is currently filming the sixth season in Spain, having previously filmed outside Seville where more than 550 extras took over the local bullring, which was used to represent a Daznak fighting pit in season five.
The recent pictures of queues in north east Spain have prompted speculation that the large crowds may be needed for Daenerys Targaryen’s ongoing battles in the continent of Essos.
According to the casting call, people who are thin with natural coloured hair were given priority. Only men with short or medium length hair were asked to apply, while women had to have long hair to stand a chance of success.
People with tattoos were eliminated from the casting process.
If successful, the Spanish extras will be needed for filming between 3 and 18 September and will be paid a mere €50 (£35) a day.
Game of Thrones season six is due to begin sometime in spring 2016.
It is not yet known if George RR Martin’s next book The Winds of Winter will be released in time for the next series, with the HBO drama likely to overtake the book series if not.