This much sought after animated mini-series for nostalgic cartoon fans is based on Pierre Berton's best-selling children's book about five young siblings and their pets' discovery of a tunnel beneath their clubhouse floor. Penny, Pamela, Patsy, Peter, Pollywog, Yukie and Earless follow it and explore an underground make-believe world of Og, where little green creatures who can only say "OG" live a fantasy life based on comic books stolen from the world above.