Girl of Steal is the first segment of episode 5 of season 3 of My Life as a Teenage Robot.
Jenny really wants a popular music player called the "Musique" which is very expensive. Dr. Wakeman says that in order to earn enough money, Jenny will have to get a job. However, Jenny is fired from every job she takes.
As Jenny passes by the Musique store, she notices an unnattended box. Making sure no one is watching, she removes the Musique from the box. Someone notices that she took it and chase her. Jenny disguises herself as a red rocket (later nicknamed Ruby Rocket) and flies home.
When she tries out the stolen Musique, she is haunted by guilt. She tries to return it; however, Dr. Wakeman takes the box that Jenny put it in, believing it's her "birthday present."
An angry mob approaches the front door, saying that they know Ruby Rocket is in the house. Jenny pretends to fight with Ruby Rocket, changing guises repeatedly.
After pretending to defeat "Ruby Rocket" (which was actually just a refrigerator that had been painted red by Jenny) and blowing it up with her rockets, Jenny told the angry mob she lost the Musique because "Ruby Rocket" still had it when she destroyed her. Suddenly, Dr. Wakeman appears, revealing she actually has the Musique, and Jenny is forced to tell the truth so her mother isn't accused of stealing it. Afterward, when Jenny admitted that she stole the Musique, she is forced to work at the Musique factory to make up for it, and realizes how pointless the fad was.
- The title and opening screen are a spoof on DC Comics' Superman title, "Man of Steel".