NBC brought back a long-lost Christmas classic this holiday season, marking the golden anniversary of the program’s debut. Fifty years ago, NBC aired a pioneering animated special starring the myopic Mr. Magoo in a musical version of “A Christmas Carol.” Longtime television producer and Temple professor Paul Gluck says it was a milestone in mid-20th century animation: “Right after it aired, Walt Disney called its producer and said, ‘This is a program of such quality that it will be seen for generations,’” said Gluck.