Where on Earth is Carmen Sandiego? - Season 4

When Carmen is captured by a judge bent on sentencing her to life in prison, Zack and Ivy are appointed to her defense team. Carmen was accused of recently stealing the Magna Carta, which she did not steal. Zack and Ivy try to gather evidence to prove Carmen did not commit this particular crime. But is she really involved after all?

When Carmen is tricked at a heist in China, she decides to get even with a Halloween surprise. She decides to set up a haunted house with items she's recently stolen. Zack is a bit frightened by all the spooky stuff in the house and has to convince himself it's all fake.

Maelstrom, a thief who was caught by Carmen during her time as an ACME detective, escapes from prison, swearing revenge on her. At first, it is reported to the detectives that he died during his escape. Zack and Ivy find out that Maelstrom is alive and see the opportunity to catch both Carmen and Maelstrom. However, when the detectives sneak aboard Maelstrom's ship, he captures them.

Zack and Ivy escape Maelstrom's ship and find out that Carmen still believes that Maelstrom died in his try to escape from the prison. Carmen wants to give him a worthy Viking-like funeral in Norway. Zack and Ivy find her beginning to give him such a funeral and are about to tell her that Maelstrom is alive when Maelstrom appears in a ship beside Carmen. He challenges her to come after him or die and then speeds off. Carmen manages to get Zack and Ivy aboard her ship and they make an agreement to join forces to capture Maelstrom.

The Chief manages to convince the local sheriff to free Zack and Ivy. They meet up with Carmen again and pursue Maelstrom. Maelstrom begins to steal items and frames Carmen for their thefts! He wants to ruin her reputation as a thief with a conscience.

Carmen's henchman Mason Dixon steals her time machine. Suddenly, he is the leader of V.I.L.E. and Carmen is only his henchwoman. Zack and Ivy have to restore the damage Mason has done and also stop him from trying to change the outcome of the Civil War.

All ACME detectives are having holidays on Seychelles. Joshua, the resident genius of the detectives, is in love with Ivy but she doesn't notice. When Carmen tries to steal Joshua's latest invention, she tries to distract the detectives by stealing supposed romantic items.

When Carmen tries to steal some treasures from industrialist Malcolm Avalon she discovers a painting representing her mother. At the same time, Lee Jordan takes the decision to become the new leader of V.I.L.E. Avalon tells Carmen, that the medallion she has with her, representing the same woman as on the painting, was a gift for his daughter, but he says, that Carmen can't be his daughter because she died in a fire and she would never have become a thief. To convince him she turns herself into the police but when Lee abducts Avalon, she breaks out again.

Has Carmen really found her father and will she stop her life of crime once and for all?