Thanks to Emilien and Noémie, England was liberated, but the war is far from over. Major Winfrey surprises them with worrying news: In Europe, secret laboratories have been reduced to rubble by Russian robots. Next, they could target English laboratories! The military once again relies on the help of the children, but this time they want to keep an eye on the two during their mission. In London, Emilien and Noémie team up with an MI3 agent, Professor Payton. The genius biologist has noticed genetic peculiarities that could explain their abilities... but before they can follow this trail, a robot attack forces them to flee! The fourth cycle of 'An Extraordinary Journey' holds great challenges, new allies and fearsome enemies in store for our brave heroes - and a journey to places that previously only existed in fairy tales!