Brother Dusk reflects on his legacy as he prepares for ascension. The Foundation arrives on Terminus and finds a mysterious object.

Brother Day meets Zephyr Halima—a would-be leader who opposes the Empire. Brother Dusk grows suspicious of Brother Dawn.

Gaal has a disturbing vision. Day's bond with Queen Sareth grows stronger. The Vault opens and reveals a cryptic message.

The Foundation makes the long journey to Terminus as Gaal and Raych grow closer. The Empire faces a difficult decision.

The Empire recruits Bel Riose to investigate the resurgent Foundation. Hari leads Gaal and Salvor to a desert planet.

Salvor faces off with an enemy of the Empire. Brothers Day and Dusk are at odds, while Brother Dawn wrestles with his truth.

A flashback reveals the origin of Gaal’s conflict between faith and science. The standoff on Terminus takes an unfortunate turn.

Hari finds himself trapped in a mysterious prison. An assassination attempt leaves Day shaken. Gaal and Salvor devise an escape plan.

The Anacreons and their hostages board the fabled Invictus warship. The bond between Brother Dawn and Azura intesifies.

Queen Sareth and Dawn share a moment as she tries to learn more about Day. Brothers Constant and Poly bring Hober Mallow to Terminus.

Gaal, Salvor, and Hari arrive on Ignis and meet the source of the strange signal they've been tracking. Dawn and Dusk are suspicious of Day.

Gaal and Hari advance their plans on Ignis. Empire grapples with an unforeseen prediction. Pritcher enlists help to investigate the Mule.

Brother Day embarks on a journey that no other Cleon has ever attempted. Salvor prepares to make the ultimate sacrifice to return home.

On Terminus, Salvor witnesses how powerful the null field has become. Brother Dawn makes a daring choice.

An unexpected ally helps Salvor broker an alliance. A confrontation between the Brothers leads to unthinkable consequences.

Day and Queen Sareth make an announcement. Tellem sows seeds of distrust between Gaal and Hari. Hober Mallow reaches his destination.

Salvor begins to question the Mentalics' motives. Hober Mallow’s proposal to the Spacers meets resistance. Brothers Constant and Poly stand trial.

A mysterious new pirate with terrifying abilities—known as the Mule—catches the attention of the Foundation and Empire.

Gaal Dornick leaves her life in Synnax behind when the galaxy's greatest mathematician, Hari Seldon, invites her to Trantor.

An unexpected alliance is formed. Pritcher, Bayta, and Toran come face-to-face with the Mule. Demerzel seeks spiritual guidance.

Demerzel struggles with the paradox of her programming. Pritcher's true loyalties are revealed. Day sets off on a quest for answers.

Chaos and destruction rain down on New Terminus. Back on Trantor, Dusk and Quent unite to assess the state of the galaxy.

Gaal and the Second Foundation reckon with the fall of New Terminus. Day faces judgment on Mycogen. Dusk's ascension looms.

A long-awaited reunion turns violent. Day looks for Song. On New Terminus, the Vault opens—and the Mule takes aim.

Gaal confronts the power of the Mule's conversions. Dusk resorts to drastic measures. Demerzel searches for clarity about the future.