Is Great-grandfather Magica real or just a fantasy? In search of adventure and mischief, a group of young Margicans decide to visit Apple Creek, an area that they know is off-limits to them. The apple orchard behind the Great Gate is very tempting so, ignoring the KEEP OUT sign, Mop - a very happy-go-lucky Margican - scales the Gate, picks an apple and eats it. This simple act has terrifying consequences for the youngsters, all of whom are captured, except for Dreary, who sets out on a perilous journey to rescue them and finds the answer to every young Margican's question.