Curious George wants to help his friend Bill build a house made of snow--an igloo! But will George's supersize igloo be too cold to sleep in?

George is so excited about spring that he wants Hundley to have Spring Fever too. But even blooming flowers, baby animals and canoe rides cannot make Hundley love spring. Even worse, Hundley gets lost in the country. Searching for his lost friend, George accidentally launches the hot air balloon rally and sails over the countryside. Luckily he manages to grab Hundley from a hilltop along the way. Together they return triumphantly to the city.