After Suyin and her twin sons were arrested by Kuvira for attempting a sneak attack on her and Baatar and Huan refused to acknowledge the metalbender as Zaofu's rightful leader, they were all imprisoned in a cavern underneath the factory where Kuvira was building a spirit energy cannon. Opal and Lin tried to convince the world leaders to launch an attack on Kuvira, though after they refused, Lin and Opal planned to rescue their family by themselves. Bolin accompanied them as well in his efforts to repair his relationship with Opal.