As avid GoT viewers and readers know, Meereen is the largest of the great Slaver Cities of Slaver’s Bay. The other two prominent cities are Astapor (the place Dany formed her own army) and Yunkai (the population she liberated at the end of Season 3). In the upcoming fourth season, Meereen will come into its own as a key setting.
Fry's casting is the latest and likely final addition to the new season's lineup. Other new cast additions include Homeland's Pedro Pascal as Prince Oberyn Martell, Rome actress Indira Varma as Ellaria Sand, Sherlock's Mark Gatiss as a Braavosi banker and, most curiously, Icelandic indie band Sigur Ros in an enigmatic role we're excited to see develop.