Macavity is the villain of the junkyard. Like Mungojerrie and Rumpelteazer, he enjoys making trouble for humans, but his tricks are more sinister than playful. Unlike the notorious duo, he is not a Jellicle, and often attempts to hurt the Jellicles in various ways. He tries to kidnap Old Deuteronomy. Little is known about his history, but Demeter and Mistoffelees are very skittish around him. He may have kidnapped Demeter when she was a kitten.
Macavity always makes a big entrance. He is a striped male, mostly red, black, and white. His mane is even wilder than Tugger's, and his claws are extremely long.