The Secret World of OG (1983)
overview : The Secret World of Og is a children's adventure about three young girls who venture into an underground cavern beneath their playhouse to look for their lost baby brother. There, they discover a land of little green people who are enamored by the world above but won't allow anyone to leave their cavern for fear they might "tell".
Release Date : Apr 30, 1983
Runtime : 1h 11m
Genre : Animation Adventure Family
Companies : Australian Broadcasting Corporation
Countries : United States of America
Keywords : underground world, underground cavern