A new Game of Thrones TV spot has arrived. It gives fans a brief look a the coming war between the kings of Westoros. Season 3 will be based on the first half of the novel A Storm of Swords by George R. R. Martin. This season also introduces many new characters from the popular book series too. Are you ready for the new season? Game of Thrones Season 3 premieres Sunday, March 31st, 2013 at 9pm EST on HBO.