The Sun Comes Up is a 1949 Metro-Goldwyn-Mayer Technicolor picture with Lassie. Jeanette MacDonald had been off the screen for five years until her return in Three Daring Daughters (1948), but The Sun Comes Up was to be her last. In it, she had to share the screen not with an up-and-coming younger actress but with a very popular animal star. Although her retreat from a film career can be blamed largely on an increasingly debilitating heart ailment (which eventually took her life at the age of 61 in 1965), MacDonald continued to make concert and TV appearances after this. Her last radio appearance was a broadcast version of this same story on Screen Guild Theater in March 1950.