The Wonderland Murders (2018)

Episode Overview

Title: The Blue Spirit Plot: As Aang, Katara, and Sokka journey together, Sokka falls ill with a fever. Katara and Aang do their best to care for him, but soon Katara succumbs to the same illness. With both friends in need, Aang must venture out alone to retrieve medicine. However, his mission takes a turn when he is captured by Admiral Zhao, who has just risen to a higher rank, and is imprisoned in Zhao's stronghold.