S4·E3 Retribution (1): The Unsinkable Carmen Sandiego

Maelstrom, a thief who was caught by Carmen during her time as ACME-detective, escapes from prison, swearing revenge on her. At first, it is reported to the detectives that he died during his escape. The detectives are curious about him and The Chief tells them about his adventure with detective Carmen. During that adventure, Carmen and a robot version of the Chief stop Maelstrom from stealing the wreck of the Titanic. At the conclusion of the story, Ivy and Zack 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.