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Fans of The Walking Dead and Legend of Korra rejoice: Steven Yeun, known to fans of the AMC horror show as Glenn, will be joining the voice cast of the Nickelodeon animated series as Wan, the very first Avatar in existence. Yeun’s character will appear in two episodes titled “Beginnings 1 & 2″ during the second season — aka Book 2: Spirits — debuting later this year. The sequel to the beloved Avatar: The Last Airbender, Legend of Korra debuted last April to 4.5 million viewers, and quickly became the highest-rated show on Nickelodeon. Both series are set in a fictional world where people called “benders&rd