"Happy Progress Day"
Years later Jayce's Hextech has expanded but at the same time so has Shimmer. A group known as the Firelights storm the recent shipment of Shimmer but Powder, now a teenager and renamed herself Jinx attempts to defend the shipment but has a violent breakdown after mistaking one of the Firelights for Vi. Jayce and Viktor show Heimerdinger new devices but the professor warns them of the potential danger of Hextech.
Jinx returns to Silco who became her father and told her of her breakdown he tells her to take some time off but she rather gain his approval the cloaked figure informs her to steal the Hextech gems so Piltover won't have a hold on them.
Meanwhile new enforcer Caitlyn was on guard when Jinx attacked, injuring several enforcers although Caitlyn was the only one to spot Jinx during her heist. Jinx returns to her lair where she shows Silco the gemstone.
Jayce becomes a councilor after Mel convinces the rest to promote him. Caitlyn was trying to find out who is behind Jinx's attack; she remembered talking to a thug at the airship who was shot by Jinx. She attempts to visit the prisoner but only finds he was injured by an adult Vi.
"Everybody Wants to Be My Enemy"
Caityln informs Vi about Jinx's attack and Vi believes this is proof that her sister is alive. Caitlyn releases Vi from prison in exchange for having a glide through Zaun. Jinx attempts to weaponize the Hex gem but is haunted by memories of the night she accidently killed her family. Vi and Caitlyn explore the city the cloaked figure has followers which they attempt to bring others into their cult wanting to "free" the timeline.
Silco takes Jinx to the same river where Vander almost drowned him in and encourages Jinx to let Powder die. The cloaked figure paused time and also encouraged her to let the past go. Vi and Caitlyn learn from an informant that Sevkia may know some of Silco's operations. Vi became more determined to destroy Silco's empire but also looking for her sister.
The cloaked figure was watching them. Vi heard his voice telling her she's the real villain not Silco.
This distraction allows Sevkia to stab Vi and reveal Powder is Jinx but Caitlyn saves Vi but allows Sevkia to escape.
Jinx was working on the gemstone successfully weaponizing it. Sevkia informs Silco of Vi's return much to his shock as he believed Vi was dead.
"When these Walls Come Tumbling Down"
Vi and Caitlyn escaped Silco's forces but also got the attention of the Firelights. Sevkia attempts to report to Silco but instead tells Jinx that Vi is back, much to her shock. Jinx feels Silco knows and decides to deliver a message to him. Vi's injuries are getting worse and need to find a doctor. Husk, someone who was loyal to Vander, offered his help and went to a Shimmer healer.
Caitlyn gets Vi fixed and learns from Vi that her parents were killed by enforcers much to the latter's shock.
Silco finds them after learning from Marcus he arrested Vi leading to her disappearance. Silco planned to kill Vi and Caitlyn to keep Jinx. Vi tells him she's going to bring his empire down first and find Jinx second. Silco made an insult to her on how she destroyed Powder instead of helping her leading her to destroy her old home.
Jinx, having some memories of Powder, lights up a signal flare so Vi can find her. The cloaked figure appears as Jinx's flare runs out. He warns her returning to Vi will destroy her and he wished to see her have a better life without Vi.
Vi appears with Caitlyn causing Jinx's mistrust and believed Vi replaced her and gets jealous but the Firelights attacked capturing Vi, Caitlyn, and the gemstone but injuring Jinx in the process.