Claudia Furschtein is one of the main antagonists in the 1987 film The Chipmunk Adventure, along with her older brother Klaus. She is very attached to her dog, Sophie, and takes her everywhere. The Furschteins run an international diamond smuggling ring, however, they are unable to find any couriers to deliver their diamonds to their buyers without being caught by police, led by INTERPOL Inspector Jamal. Upon hearing The Chipmunks and The Chipettes arguing about who would win a race around the world, Claudia and Klaus arrange a hot-air balloon race for them, tricking them into unknowingly aiding the illegal delivery of diamonds to various locations around the world. However, when she learns that the Chipettes have diverted from their route, unaware that they were delivering a baby penguin back to its family in Antarctica, fearing the Chipettes have discovered the ruse, she sends her men to capture them and retrieve the money they had collected, along with any diamonds they still had not delivered.
She has a butler, Mario, who turns out to be a spy for Jamal. Mario had been secretly relaying information about the Furschteins' operation to Jamal, but when it is learned that the Chipmunks and Chipettes are returning to the USA and will be landing at the airport soon, Claudia catches Mario as he was telling Jamal he would meet him there, and offers to take him there herself, as a hostage now that she knew he was a mole for INTERPOL.
When she and Klaus meet the Chipmunks and Chipettes at the airport in the Chipettes' balloon, she tries to act happy at seeing them, only for Alvin and Brittany to reveal they know the truth about the whole race. Their cover blown, the Furschteins chase the Chipmunks and Chipettes through the terminal until forcing them into their car under threat of kidnapping Miss Miller if they refuse to cooperate. However, as they drive off, Claudia soon sees red and blue lights behind them, and realizes that Jamal is in hot pursuit of them in a marked police cruiser. Thinking fast, she has her driver cause a traffic accident, forcing Jamal to stop to deal with it. However, as Claudia smugly gloats that, in minutes, she and Klaus would be on their private jet bound for Costa Rica and safety with the Chipmunks and Chipettes as their hostages, her near victory is ruined as karma catches up to her when Miss Miller comes roaring up the highway going the wrong way, leaving Claudia horrified as her driver swerves to avoid Miss Miller, and crashes into a lamppost, wrecking the car, and leaving Claudia and Klaus stunned before Jamal arrives with police backup, and smugly tells them that they are finally under arrest. Klaus sarcastically toasts Claudia before they are handcuffed and placed in the back of a cruiser by Jamal. However, Claudia still gets off one last rant as she tells the officer taking Sophie away that he'll pay if anything happens to Sophie before being carted off to prison.