UFOs Season 1: The dreams of brilliant space engineer Didier Mathure literally go up in smoke when his much-hyped new rocket explodes on take-off. His career at rock bottom, Didier finds himself sidelined as the head of GEPAN, an obscure and improbable research group specializing in UFOs whose members seem to be living on another planet themselves! With the help of his new oddball friends, a shower of flamingos is the first mystery Didier has to solve if he wants to get his career back on the rails. It's a nightmare job for an out-and-out rationalist, and Didier is determined to find a way out as soon as he can. But an extraordinary event unsettles his convictions and opens the doors to a world where anything is possible.

UFOs Season 2: Didier has been ousted from GEPAN and has now become a UFO evangelist himself - much to the chagrin of his ex-wife Elise, a down-to-earth scientist recently promoted to head the French space agency: CNES. When the sudden manifestation of a giant ball of cotton candy in a nuclear power plant sets off alarm bells at the highest levels, Didier is called back into action and the GEPAN gang have a big new mystery to solve. Convinced that an extraterrestrial being is trying to make contact, Didier will do everything he can to uncover the truth - even as powerful forces consipre against him.