An Egyptian military commander, Radamès, struggles to choose between his love for the enslaved Ethiopian princess Aida, and his loyalty to the Pharaoh. To complicate the story further, the Pharaoh's daughter Amneris is in love with Radamès, although he does not return her feelings.

While the rest of the Hebrews bewail their fate, Samson alone trusts in God's promise of liberty. Abimelech, the Philistine satrap of Gaza, enters to mock the Hebrews' God, proclaiming the superiority of Dagon, and the Hebrews are afraid of him. But calls them to show some defiance, so Abimelech attacks Samson with his sword. Samson seizes the sword and strikes him dead. The Hebrews scatter and the High Priest of Dagon appears, cursing the Hebrews. When a messenger reports that the Hebrews are ravaging the harvest, the High Priest forms a plan to use Delilah to overcome Samson's strength. Delilah's beauty is such that Samson can't resist her for long. She begs to know the secret of his supernatural strength, but he refuses, though he says he loves her. Delilah betrays Samson by having some Philistine soldiers seize him and throw him into a prison in Gaza, where his hair is cut off.

Donald Runnicles directs the San Francisco Opera in this lavish production of Giacomo Puccini’s final masterpiece, which was left unfinished upon his death and was later completed by Franco Alfano. Declaring himself a suitor of the beautiful Princess Turandot (Eva Marton), the son of a conquered king (Michael Sylvester) must correctly answer three troublesome riddles. According to tradition, if he fails, it will mean his death.