Matt Hildago is a government agent who disguised himself as maid named Matilda to undercover Milo Meekly and the Shark Men's scheme at Shark Island. After Mystery Inc. solved the mystery with the help from Sonny & Cher, Matt took Milo and his men to jail in The New Scooby-Doo Movies episode, "The Secret of Shark Island".
Matt is a middle-aged man. He wears a brown trench coat with buttons.
Matt is the stern yet fair person who dedicates his job as the police officer. He intends to find information about Milo by going undercover. He can be pragmatic in his mission making the Mystery Inc suspicious of him. In general, Matt has a strong sense of justice.