"When every single person over the age of 15 mysteriously disappears, the children are left to fend for themselves. While some turn to looting, Sadiq leads a small group to the safety of the City Hotel."

"Callum's new gang intend to take over the City Hotel, using Kat to gain access. Meanwhile, Reese visits the library to learn more about the Sparticle Project, and sees 'ghosts' of the adults there."

"While visiting the university to find food, Reese discovers a message from Doomsday Dora explaining how the adults disappeared and urging the children to help them return. Meanwhile, Holly is held hostage by the only remaining adult."

"To decide who will lead the quest to reunite the two worlds, the tribe compete to find a new power source. It becomes more urgent when they discover the hotel's boiler is about to explode unless the electricity can be restored."

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"Dora's clue leads the Questers to a science facility where the Sparticle Project was developed. But the simulator leaves Ami, Jordan and Holly trapped in a room with the particle collider's cooling system as the temperature drops."

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"The Questers replenish their food supplies at a seemingly abandoned farm, but are caught red-handed by the farmers who accuse them of stealing. Meanwhile, a group of hungry girls follow Liam back to the City Hotel and demand to be fed."

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"Without the adults to keep things running smoothly, nuclear power stations start leaking deadly radiation. The Questers must find a way to get a message to the adults."

"Ami desperately needs insulin for his diabetes, but the youngsters now running the hospital don't take kindly to the visitors. Meanwhile Tia worries that her approaching 15th birthday could mean she will disappear like the adults."

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