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Season 1 - Apr. 14, 2012
Season 2 - Sep. 13, 2013
Season 3 - Jun. 27, 2014
Season 4 - Oct. 03, 2014

The Legend of Korra Season 4 Episode 7
HD
Overview:
Korra returns to Republic City and Team Avatar faces their first mission together in three years when Prince Wu goes missing; Bolin and Varrick are on the lam.