Battle for the Pride Lands.Kion and the Lion Guard have grown into teenagers and continue to defend the Pride Lands from Scar and his army. Simba suggests they take the battle with Scar into the Outlands to defeat him once and for all. Meanwhile, Janja finds himself starting to consider joining Jasiri's clan. That night, the Lion Guard gathers all of their allies, and Janja’s clan is sent to distract them. Unbeknownst to Janja, however, Scar has Mzingo’s flock and Kiburi's float set fire to Pride Rock to take out his clan as well as the royal family and the Guard. Realizing Scar has betrayed them, Janja asks for Jasiri's help while the Lion Guard escapes through an underwater tunnel along with the other hyenas. Janja tells Kion of the supposed way to vanquish Scar, by using the Roar at full power inside the volcano. Unknown to Janja, this is part of Scar's plan to trick Kion into causing the volcano to erupt, destroying the Pride Lands. Scar tells Ushari the story of when he got his scar from a strange lion and cobra and was teased by Mufasa, leading to his downfall. The next morning, the Pride Landers army charges into the battle with Scar's army, allowing the Lion Guard to get to the top of the volcano. Once they reach the pit, Scar has Ushari bite Kion on the face, giving him a scar as well. Kion, refusing to use violence, instead has the Great Lions of the Past vanquish Scar. Ushari tries to attack Kion again, but is knocked into the lava pit by Bunga and is killed. Ono suffers eye damage from the ash fumes while rescuing Bunga. With Scar gone, Janja determines that Jasiri should assume control of the Outlands, and she accepts. Back at Pride Rock, Rafiki instructs Kion to eat Tuliza blossoms to help soothe the venom, and deduces that Kion and Ono’s injuries can be healed by the Tree of Life, a faraway place where sick animals go to get better. Due to Ono's eye damage, Kion names Anga as the new keenest of sight and renames Ono as the smartest member. With Ono having memorized each of the landmarks, the Lion Guard sets off on a journey to the Tree of Life, with Makini joining them.