Season guide

Who Do You Think You Are?: Season 17

4 episodes Premiered Oct 12, 2020 Updated Oct 3, 2026

Previously on Who Do You Think You Are?

Season 17 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

⚡ Directly follows the overarching narrative developments of Who Do You Think You Are? Season 16.
⚡ Faction dynamics and core character alliances shift under escalating external stakes.
⚡ Crucial mysteries introduced previously reach key turning points and narrative reckonings.
⚡ Sets up serialized story arcs that build directly toward the climactic season finale.

Season 17 Episodes

Episode Guide

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Season 17 Progress Shield

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Season 17: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

50%

Mytharc (2): Crucial lore & season climaxes

Core (2): Character development & subplots

Side Quest (0): Standalone / filler

S17·E1 Mytharc

Jodie Whittaker

Oct 12, 2020 · 60 min

Doctor Who actor Jodie Whittaker finds out how her great-great-grandfather worked his way up from child labourer in a Yorkshire coal mine to mine owner.

S17·E2 Core

David Walliams

Oct 19, 2020 · 60 min

David Walliams learns of his great-grandfather’s traumatic experiences during the First World War, which condemned him to a lifetime in what was then called a lunatic asylum.

S17·E3 Core

Ruth Jones

Oct 26, 2020 · 60 min

Actor Ruth Jones - Nessa from Gavin and Stacey - uncovers her grandfather's role in the Medical Aid Societies of south Wales, which provided a model for the NHS.

S17·E4 Mytharc

Liz Carr

Nov 2, 2020 · 60 min

Silent Witness actor Liz Carr gets forensic about her family history, discovering that her great-great-great-grandfather was involved in an attempted murder in rural Northern Irela