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".
TAGLINE:
A world of adventure is waiting beneath their clubhouse floor.