NASA's Unexplained Files
S4 E8
5/16/19
Secrets of the Alien Signals
When NASA begins a strange experiment to communicate with dolphins, experts investigate if it's a prelude to making alien contact, but some fear that such a discovery could have apocalyptic consequences.
Seasons
Episode
1
Pluto's Evil Twin
Episode
2
The Black Hole Next Door
Episode
3
Aliens vs. Stalin at Area 51
Episode
5
Planet of the Metal Aliens
Episode
7
Aliens in the Amazon
Episode
8