Harmless if flat-footed silliness--as Milton the big clumsy moose, who wants to help Santa's reindeer pull the sleigh, learns how to land lightly on rooftops and how to wait patiently while Santa delivers presents. . . to the end that, when the reindeer grow tired, he saves Christmas ""for millions of children"" by pulling the sleigh alone. No strain, certainly, but about the content of one day's comic strip.