S21·E20 Episode 20
Core
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Frequently Asked Questions
When did Season 21 Episode 20 of Ancient Aliens air?
Season 21, Episode 20 ('Episode 20') is listed in the official schedule.
How long is Season 21 Episode 20 ('Episode 20')?
The episode follows the standard broadcast runtime for Ancient Aliens.
All Ancient Aliens episode ratings Season 21 Where to watch
Top-rated Ancient Aliens episodes
- S2E8 · Unexplained Structures ★ 9.2
- S2E3 · Underwater Worlds ★ 8.8
- S2E6 · Alien Tech ★ 8.6
- S2E4 · Underground Aliens ★ 8.6
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