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

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

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

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

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

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

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

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

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.

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

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

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

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

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.

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.

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

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