Encyclopedia is Leroy Brown, the son of Chief Brown, the police chief. He is called “Encyclopedia” because he has an extraordinary memory and vast knowledge, much like an encyclopedia book. He knows facts on many subjects and helps solve mysteries that even adults struggle with. Despite this, he prefers to be called by his real name, Leroy, especially by his parents and feachers. The nickname stuck because everyone else recognized his intelligence and ability to recall important details instantly.