Season 1
- Katherine Waterston as Jess
- Emily Watson as Mrs Martin
- Paddy Considine ( ) as Mr Martin
- Mark Lewis Jones as Jason
- Joe Blakemore as Smiling Boy
- Amer Chadha-Patel as Preacher
- Freya Allan as Kail
- Börje Lundberg as Professor Mimir
- Stanley Auckland as Boy with glasses
- Tom Lawrence as Tomo
The Third Day (2020) [Season 1, Episode 1]
Friday - The Father
Shown 14 Sep 20
The Third Day (2020) [Season 1, Episode 2]
Saturday - The Son
Shown 21 Sep 20
The Third Day (2020) [Season 1, Episode 3]
Sunday - The Ghost
Shown 28 Sep 20
The Third Day (2020) [Season 1, Episode 4]
Monday - The Mother
Shown 05 Oct 20
The Third Day (2020) [Season 1, Episode 5]
Tuesday - The Daughter
Shown 12 Oct 20
The Third Day (2020) [Season 1, Episode 6]
Last Day - The Dark
Shown 19 Oct 20
The Third Day (2020) [Season 1, Episode 7]
Shown th October 2020
The Third Day (2020) [Season 1, Episode 8]
Shown th October 2020
The Third Day (2020) [Season 1, Episode 9]
Shown th October 2020
The Third Day (2020) [Season 1, Episode 10]
Shown th October 2020
The Third Day (2020) [Season 1, Episode 11]
Shown th October 2020
The Third Day (2020) [Season 1, Episode 12]
Shown th October 2020
The Third Day (2020) [Season 1, Episode 13]
Shown th October 2020
