Series synopsis
Oíche Shamhna: An Ancient Mystery is a documentary television series that premiered on RTÉ One on October 26, 2025. It ended on October 27, 2025.
Exploring mythology, archaeology and science, this series reveals Halloween’s ancient origins in Ireland.
Premise
Exploring mythology, archaeology and science, this series reveals Halloween’s ancient origins in Ireland.
Episodes
This series spans 1 season with 2 episodes.
| Season | Episodes | First aired | Last aired |
|---|---|---|---|
| Season 1 | 2 | October 26, 2025 | October 27, 2025 |
| Episode | Title | Air date |
|---|---|---|
| 1 |
Episode 1 Exploring mythology, archaeology and science, this series reveals Halloween’s ancient origins in Ireland. Episode 1 explores Halloween’s origins in the festival of Samhain |
October 26, 2025 |
| 2 |
Episode 2 Ancient legends and science at a mysterious cave reveal the origins of Samhain and Halloween. |
October 27, 2025 |
Production
Release
| Original network/platform | RTÉ One |
|---|---|
| First aired | October 26, 2025 |
| Last aired | October 27, 2025 |
| Runtime | 99 minutes |
| Status | ended |