The Chitauri and Thanos have returned to seek revenge upon Loki. Now it is up to Thor to find and rescue his wayward, injured brother but Thor cannot protect Loki alone; he must rely on his newly acquired allies if he is to keep his brother safe. Danger follows and a battle must be won. (*dark content within important character death)

A broken god crashes onto the roof of Stark Tower, and Tony and Steve are horrified by what they find. As Loki's story unfolds, the Avengers discover what really happened when Loki was taken back to Asgard, and what he has endured for the past year. A powerful enemy emerges to threaten Asgard as Loki struggles to recover in the care of those who were once his bitterest foes.