Having made contact with the tunnel kids, or the Unlisted, Dru and Kal attempt to piece together what they know about the Global Child Initiative and Infinity Group. But they are interrupted by a medical emergency.
During a fitness test, Dru struggles to keep up with his classmates. The twins look into Infinity Group, the organisation behind the dental check-up, which leads them to a mysterious group of unnamed kids.
When they discover the true purpose of the Global Child Congress, the Unlisted hatch a plan to take down the GCI mainframe. Kal's strange behaviour forces Dru to make a painful decision.
Dru avoids a school dental check-up by persuading his twin brother Kal to go in his place. While celebrating Diwali, they notice Kal's new abilities. Could they be linked to a warning from recently disappeared classmate Tim?
The Unlisted and Dru make a last-ditch attempt to bring down Infinity Group. Emma Ainsworth introduces Kal to the world, and makes a surprising discovery that threatens to derail the organisation's sinister plan.
The Unlisted attempt to bring down the mainframe at HQ - but walk into a trap. Under complete mind control, Kal becomes an Infinity stooge, and sets out to track Dru down.
As Infinity Group's hunt for missing children ramps up, the Unlisted make themselves at home in the Sharma house. Dadi becomes a powerful ally when she stumbles across the kids. But Kal's behaviour grows increasingly erratic.
Kymara makes a mistake that places the other Unlisted in danger. The twins face increased scrutiny following a new arrival at the Sharma house, Chinese exchange student Jiao.
Horrified by what has happened to Jiao, the twins team up with Bua to bring down Infinity Group from the inside. But as the GCI takeover continues at school, the boys are barely able to maintain their cover.
The twins manage to get a message to Rose and Mack through Bua. An elaborate escape plan goes awry when Regan gets involved, and the kids have to act fast to avoid being found out - or worse.