In preparation for her birthday celebration, the Smurfs read the story of Smurfette, how she was created by Gargamel to destroy them, only for Papa Smurf to rescue her and turn her fully into a Smurf. Meanwhile, she is having nightmares about reverting to her original form and betraying her fellow Smurfs by turning them over to Gargamel. The Smurfs are preparing a surprise party, but as Smurfette tries to find out what her fellow Smurfs are planning, none of them are saying a word. She takes this to mean that everyone has forgotten her birthday.