The Missing Piece is the eighth episode of Foundation's first season on Apple TV+. It aired on November 5, 2021. The episode was written by Sarah Nolan based on the novels by Isaac Asimov. Roxann Dawson directed the episode.
In the past, a young Phara Keaen and her young brother are playing on their home world of Anacreon. Phara spots lights in the sky which turns out to be a bombardment. She watches on in horror as tragedy strikes. Now Grand Huntress of Anacreon, Phara and Foundation members continue their journey through the Invictus to the bridge.
On The Raven, Gaal Dornick and the digitized version of Hari Seldon continue their path towards Hari’s home world of Helicon. The pair discuss the revelation of Gaal’s ability to tell the future, and Hari grows cautious of how this may affect the Foundation going forward. Gaal wonders why Hari wants to go to Helicon and grows frustrated at Hari’s reluctance to tell her. She has to decide what she wants to do.
On The Maiden, Brother Day begins his journey into The Spiral. He meets a companion on this journey, who enlightens him on the mysteries of The Spiral and of the person's homeworld. This journey has ramifications on Zephyr Halima and on Brother Day’s closest aid.
Salvor opens the door to the bridge of The Invictus, and is able to retrieve a weapon to open fire on the Anacreons. She and Lewis are able to make it to the other side of the door as it closes, separating them from their captors. As Phara and Rowan work to open the doors, Lewis and Salvor deduce what happened on the bridge and then work out a means to navigate the ship.
Phara and Rowan override the doors as other forces also arrive and attack the ship, as it prepares to jump.
- Jared Harris as Hari Seldon
- Lee Pace as Brother Day (Cleon XIII)
- Lou Llobell as Gaal Dornick
- Leah Harvey as Salvor Hardin
- Laura Birn as Demerzel
- Elliot Cowan as Lewis Pirenne
- Daniel MacPherson as Hugo Crast
- Sasha Behar as Mari Hardin
- Kubbra Sait as Phara Keaen
- Pravessh Rana as Rowan
- T'Nia Miller as Zephyr Halima
- Julia Farino as Zephyr Gilat
- Michael Elwyn as Pilgrim Eskel
- Ann Firbank as Crone Zephyr
- Jayne Giordanella as Mother Zephyr
- Sarah Naudi as Maiden Zephyr
- Nikol Kollars as Jacenta
- Nikhil Parmar as Freestone
- Geoffrey Cantor as Ambassador Thanwall
- Gerard Lee as Imperial Doctor
- Muiris Crowley as Captain Tacud
- Naisha Kripalani Dhankani as Young Phara
- David Jacob Sumod as Ilex
- Abby Dunlavy as Spacer
- Kez Anderson as Spacer
- Micky Pridhanani as Anacreon Soldier
- Shauna Black as The Raven Computer
- Christopher Marren as The Invictus Computer
- Emma Campbell as Cryopod Computer