Season 21 · Documentary

Ancient Aliens 2025 (season 21): U.S. release date, episode schedule and where to watch

Name: Ancient Aliens
Genre: Documentary
Cast: Robert Clotworthy, Giorgio A. Tsoukalos, David Childress, William Henry, Jonathan Young

Season 21 of Ancient Aliens aired from February 7, 2025 to November 6, 2025 on History (17 episodes).

Season complete Cable Verified October 3, 2026

Artwork via TVmaze · © its respective owners

Quick answer

Ancient Aliens season 21 ran from February 7, 2025 to November 6, 2025 on History (17 episodes).

U.S. premiere: February 7, 2025
Where: Cable
Time: Varies by station
Episodes: 17
Finale: November 6, 2025

Season 21 episode schedule (U.S.)

Ancient Aliens season 21 U.S. episode schedule
Ep.	Title	U.S. date	Time	Status
1	The Top Ten Extraordinary Discoveries	Fri, Feb 7, 2025 ^[1]	Check local listings national slot	Listed
2	The Top Ten Mysterious Monoliths	Fri, Feb 14, 2025 ^[1]	Check local listings national slot	Listed
3	The Top Ten UFO Crashes	Fri, Feb 21, 2025 ^[1]	Check local listings national slot	Listed
4	The Top Ten Unexplained Technologies	Fri, Feb 28, 2025 ^[1]	Check local listings national slot	Listed
5	The Top Ten Secret Projects	Fri, Mar 7, 2025 ^[1]	Check local listings national slot	Listed
6	The Top Ten Mysterious Mountains	Fri, Mar 14, 2025 ^[1]	Check local listings national slot	Listed
7	Mysteries of the Aztecs	Fri, Mar 21, 2025 ^[1]	Check local listings national slot	Listed
8	The Glowing Orb Phenomenon	Fri, Mar 28, 2025 ^[1]	Check local listings national slot	Listed
9	The Legacy Of J. Allen Hynek	Fri, Aug 29, 2025 ^[1]	Check local listings national slot	Listed
10	The Volcano Factor	Fri, Sep 5, 2025 ^[1]	Check local listings national slot	Listed
11	The Birdman Mystery	Fri, Sep 12, 2025 ^[1]	Check local listings national slot	Listed
12	The Abduction Files	Fri, Sep 19, 2025 ^[1]	Check local listings national slot	Listed
13	The Giants	Thu, Oct 2, 2025 ^[1]	Check local listings national slot	Listed
14	Aliens In Our Midst	Thu, Oct 9, 2025 ^[1]	Check local listings national slot	Listed
15	Britain's UFO Files	Thu, Oct 16, 2025 ^[1]	Check local listings national slot	Listed
16	Mysteries Of The Norse Gods	Thu, Oct 23, 2025 ^[1]	Check local listings national slot	Listed
17	Secrets Of Japan	Thu, Nov 6, 2025 ^[1]	Check local listings national slot	Listed

Broadcast times are the network's national slot and your local station may differ. Streaming times are converted to your time zone when your browser allows it.

Where to watch season 21

Where to watch Ancient Aliens season 21 in the U.S.
Where	How	When	Notes
Cable	Broadcast (free)Antenna / cable	February 7, 2025 – November 6, 2025	Original U.S. run on History. [1]

Common questions

When was the first episode of Ancient Aliens season 21?

Season 21 episode 1 premiered on Friday, February 7, 2025 on History.

How many episodes are in Ancient Aliens season 21?

Season 21 has 17 episodes; the finale aired on Thursday, November 6, 2025.

About Ancient Aliens

Ancient Aliens is a documentary series that aired on History, running since 2010 with 22 seasons and 292 episodes. Ancient Aliens is still running; its most recent episode aired on August 6, 2026.

Where to watch every season of Ancient Aliens →