Jupiter is in love with the goddess Diana's votary, Callisto. On the advice of Mercury, Jupiter takes on Diana's guise. Meanwhile, Diana falls in love with the shepherd Endymion. Further, Jupiter's wife, Juno, calls on the Furies to turn Callisto into a bear in order to enact revenge upon her husband. Jupiter manages to turn Callisto back into a woman and wins her heart without the need for a disguise.