Mimi has invited Roberta and Grorex skiing. "Yupi!" exclaims Roberta. After a quiet night at Mimi's chalet, and after renting the skis, it is time to have fun. But Grorex is hungry and cold and while Mimi glades down beautifully and Roberta can zigzag, Grorex is a major disaster and ends up transformed in a huge snowball.