The snow covered mountains; but not to worry, rescue dog Pluto is on duty. Actually, given that he barely keeps himself safe, maybe you should worry. A playful seal keeps stealing his cask of grog.

When a pilot has to turn back due to a severe storm, he drops the mail at a remote outpost where it can be delivered by dogsled. The falling mail pouch lands on Pluto, and he sets out to deliver it.