At the beginning of the film, the Smurfs recall the story of how Gargamel created a Smurfet to use it in his insidious plan to capture the blue men he hated. Only Papa Smurf managed to make a beautiful creature out of a dark personality and endow her with a magnificent, kind heart. Now Smurfeta is like a ray of sunshine, giving warmth and joy to a small but incredibly cozy village. The only thing that bothers Smurfeta lately is creepy dreams, where she returns to her monstrous original appearance, which still scares her.

On her birthday, it seems to her that everyone has forgotten about her, and sadness appears in her eyes, but in fact this is not true and everyone is secretly preparing to celebrate this wonderful holiday on a grand scale. At the same time, Gargamel has a huge success in France, where he amuses the audience with his magic. But the magic powder is excised, and soon he will not be able to work miracles, and therefore he needs to replenish stocks as soon as possible, well, for this, Smurfs are urgently needed. To carry out a new plan, he decides to re-create the false Smurfs, Splinter and Sturdy, who will help him kidnap Smurfeta back.