Caprica" executive producer Jane Espenson will pen the sixth episode of "Game of Thrones," an epic HBO fantasy series based on novels by George R.R. Martin.

Espenson, who will serve in a freelance capacity, is the final addition to the writing staff for Season 1, which makes its debut in the spring of 2011. The season will feature 10 episodes, and the series will span a novels worth of material per season.

Production is scheduled to start in Northern Ireland in June. Hiring for a variety of production jobs has already begun.

Joining Espenson in penning the debut season are script coordinator Bryan Cogman, who'll write the fourth episode of the season; Martin himself on an unidentified episode; and executive producers David Benioff ("Troy," "The Kite Runner") and D.B. Weiss, who'll handle the remainder of the episodes.

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