Dusk and Enjoiner Rue learn Demerzel's origin and true purpose. Tellem's plans for Gaal take a dark turn. On Terminus, Day confronts Dr. Seldon.

Enjoiner Rue confides in Dusk about her distrust of Demerzel. Hober Mallow pulls a daring move. Day sets course for Terminus and the Foundation.

Gaal, Salvor, and Hari chart a new path forward on Ignis. Demerzel heads to Trantor, taking actions that will change Empire forever.

Day enters uncharted territory. Dawn and Gaal put their plan in motion. Magnifico's worth becomes clear. Demerzel attempts to restore power.

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

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.

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

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

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.

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

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.

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.

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 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.