: In " The Drill ," Aang and his friends must stop a massive Fire Nation war machine from breaching the outer wall of Ba Sing Se. In "City of Walls and Secrets," they finally enter the city and discover the unsettling influence of the Dai Li. Original Air Date : September 15, 2006 ("The Drill"). Where to Watch in English
: Provides the episode for purchase or streaming, listed as " The Drill ". Amazon Prime Video : Available for purchase on Prime Video.
Watch the Gaang arrive at the legendary Earth Kingdom capital in this official clip from Paramount+:
