Episode Title:Day of the ColossusEpisode Description:The group evades Kuvira's attack and retreats to Asami's office. Acting on advice from Baatar Jr., they decide to use their flying mecha suits to pierce the mecha's armor and destroy it from the inside. Lin also releases Hiroshi Sato, who agrees to help them to atone for his previous actions. Varrick proposes to Zhu Li, who accepts. The two of them, along with Asami and Hiroshi, attack the mecha. Hiroshi sacrifices himself to open a hole and allow Team Avatar to infiltrate it. The Last Stand; Team Avatar take the fight to the mecha-tank. After Hiroshi's unexpected sacrifice they succeed in bringing down the mecha-tank with very painful injuries. Korra demands Kuvira to surrender but she refuses and flees into the spirit vine forest where she unleashes the crashed mecha-tank's cannon against the city accidentally. Korra succeeds in saving them both and it opens a spirit portal where she redeems Kuvira...