The GEPAN team must find a way to prevent Claire's experiment, which is scheduled to take place that very evening! In desperation, Didier asks Élise to help him save the world. Didier has one last idea: he wants to take advantage of François Duluc's appearance on a TV charity show to remotely activate the cotton candy and disable the particle accelerator, thus preventing a catastrophe.

Several pilots and control towers around the world register hundreds of approaching UFOs on their radar, indicating a possible alien invasion. Claire tells Didier that she has been contacted by Delbrosse, his former enemy who has returned from the afterlife.