Shirley McLoon is an agent of the Treasury Department. She pretended to be a psychic medium while she was undercover.
She is an African-American female with short black hair.
Takes her job as a federal officer for the Treasury Department very seriously. She'll stop at nothing until she's captured any counterfeiter she tries to bust down, even going undercover.
A Pup Named Scooby-Doo
She was put in a cell of the Furgeson Estate by the Ghost (the disguise of Mr. Conrad) when she went looking for it. She was also considered by the gang as a suspect for the crime. Finally, when Mr. Conrad was unmasked, she arrested him. (A Bicycle Built for Boo!)
- Shirley's name is a play on the famous New Age aficionado Shirley MacLaine.
- Series producer/developer Tom Ruegger eventually later reused the name for Shirley "the Loon" McLoon, one of the characters on Tiny Toon Adventures (which he was also a producer on), whom was also into psychic powers and fortune-telling.