USA,
2012, 7 h 2 min
(Length: 42–86 min)
Episodes(8)
-
American Killers (S04E01)
-
Pack of Teeth (S04E02)
-
Invisible Executioner (S04E03)
-
Asian Slayer (S04E04)
-
Russian Killer (S04E05)
-
Mongolian Mauler (S04E06)
-
Phantom Assassin (S04E07)
-
Lair of Giants (S04E08)
Gallery (104)
Invisible Executioner (S04E03)
Photo © Discovery Networks
![River Monsters - Season 4 - Invisible Executioner - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/167/122/167122627_113aba.jpg)
Invisible Executioner (S04E03)
Photo © Discovery Networks
![River Monsters - Season 4 - Invisible Executioner - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/167/122/167122628_a81248.jpg)
Invisible Executioner (S04E03)
Photo © Discovery Networks
![River Monsters - Season 4 - Invisible Executioner - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/167/122/167122629_d3dc1d.jpg)
Invisible Executioner (S04E03)
Photo © Discovery Networks
![River Monsters - Season 4 - Invisible Executioner - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/167/122/167122630_b32ef8.jpg)
Invisible Executioner (S04E03)
Photo © Discovery Networks
![River Monsters - Season 4 - Invisible Executioner - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/167/122/167122631_f0b12e.jpg)
Invisible Executioner (S04E03)
Photo © Discovery Networks
![River Monsters - Season 4 - Invisible Executioner - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/167/122/167122632_751940.jpg)
Invisible Executioner (S04E03)
Photo © Discovery Networks
![River Monsters - Season 4 - Invisible Executioner - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/167/122/167122633_009ada.jpg)
Invisible Executioner (S04E03)
Photo © Discovery Networks
![River Monsters - Season 4 - Invisible Executioner - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/167/122/167122634_ff1239.jpg)
Asian Slayer (S04E04)
Photo © Discovery Networks
![River Monsters - Season 4 - Asian Slayer - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/167/122/167122566_cc0596.jpg)
Asian Slayer (S04E04)
Photo © Discovery Networks
![River Monsters - Season 4 - Asian Slayer - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/167/122/167122568_40d1dd.jpg)