The monkey is one of the wild animals in Crystal Cove Animal Asylum for the Criminally Insane.
It has black fur and gray skin, and its eyes are open very wide.
It appears to be emotionally disturbed and violent.
Scooby-Doo! Mystery Incorporated
Officer Johnson was showing Mystery Incorporated the Asylum when a monkey appeared and tried to attack the gang from its cage, making them jump back, and Shaggy Rogers to climb the wall. Johnson told them not to make eye contact.