A young porcupine grows up fast on the north rim of the Grand Canyon as she seeks shelter from plunging temperatures and fierce winds and protects herself from the many dangers of her wilderness habitat.
Spike is just learning about his new quills from his friend Rupert, but when Rupert gets in trouble with Bear, Spike must use his imagination and his own quills to save him.
Hamlet, a pig with a vision, determines to build the biggest sandcastle in the world. His porcupine friend Quince is his reluctant partner who worries that things will go wrong, and sure enough, when the tide comes in it brings trouble.