Dr. Craig O'Connell and shark photographer Andy Casagrande travel up the Serena River in the rainforests of Costa Rica to try and find out why young bull sharks swim up the river, and how they avoid the very large American crocodiles living there.
Dr. Jonathan Werry and Andy Casagrande travel to a special location in South Australia to research a new great white hunting strategy, where they no longer wait for seals to enter the ocean - they come out of the water and snatch them from the shore!
Actress and producer Charlize Theron and cinematographer Andy Casagrande share stories of the "sharkiest" place on Earth and then answer shark week fan questions.
