Season 21 aired between 07 Feb 2025 and 06 Nov 2025, 20 episodes.
Episodes
E01
The Top Ten Extraordinary Discoveries
07 Feb 2025
E02
The Top Ten Mysterious Monoliths
14 Feb 2025
E03
The Top Ten UFO Crashes
21 Feb 2025
E04
The Top Ten Unexplained Technologies
28 Feb 2025
E05
The Top Ten Secret Projects
07 Mar 2025
E06
The Top Ten Mysterious Mountains
14 Mar 2025
E07
Mysteries of the Aztecs
21 Mar 2025
E08
The Glowing Orb Phenomenon
28 Mar 2025
E09
The Legacy of J. Allen Hynek
29 Aug 2025
E10
The Volcano Factor
05 Sep 2025
E11
The Birdman Mystery
12 Sep 2025
E12
The Abduction Files
19 Sep 2025
E13
The Giants
02 Oct 2025
E14
Aliens In Our Midst
09 Oct 2025
E15
Britain’s UFO Files
16 Oct 2025
E16
Mysteries Of The Norse Gods
23 Oct 2025
E17
Secrets of Japan
06 Nov 2025
E18
Episode 18
E19
Episode 19
E20
Episode 20