Hackus and Vexy were created by Gargamel to harness Smurf esscense. They trapped Gargamel's cat, Azrael and asks Gargamel if he's proud of them which he says no. When Gargamel plans to capture Smurfette so he can turn the Naughties into real smurfs, he can't fit in the portal so Vexy kidnaps her and she fights Clumsy. When Gargamel introduces Hackus and Vexy to Smurfette and Clumsy, she refuses talk and the Naughties attack each other(including Azrael). When Smurfette and Clumsy tries to escape, Gargamel traps them in a vase and Hackus breathes on the glass. As Hackus talks with Vexy, Smurfette and Clumsy escapes and flees making the Naughties follow them. Hackus causes trouble in a market store and escapes with the girls. Hackus eats mud, thinking its pudding until Alvin tells him it's mud. They escape from Azrael and Alvin and Clumsy teaches them how to ride a bird. They arrive at the hotel and Alvin and Clumsy teaches them how to hug. Gargamel arrives with a birthday present for Alvin and Hackus plays with a Gargamel action figure. They later go on a Magic Show and Chipmunks uses her wand to make the car go faster. At the lair, Hackus and Vexy began to disappear because Gargamel did not feed them with Smurf esscense so Smurfette gives him the formula. The Naughties become real Smurfs and they are put into the Smurfanator along with Chipmunks. After Gargamel leaves, Papa Smurf and the other Smurfs arrive to free Chipmunks who also decided to free the former Naughties, but they are captured by Gargamel. Patrick and Victor arrive and destroy the Smurfalator which causes a huge explosion. Hackus and Vexy are introduced to the rest of the Winslow family and Chipmunks blasts Gargamel away with her wand. Chipmunks makes 7 time-traveling crystals and the Smurfs return to their brothers, and Hackus kicks Brainy Smurf after he's told to by Gutsy Smurf. As the Smurfs celebrate Alvin's birthday, Jokey Smurf gives Hackus a joke-bomb present which he eats and burps out flames making him and Jokey laugh.