"Amphibian" follows an American surgeon living in the Amazon who gives his son shark gills to survive a fatal respiratory disease. The young man's underwater life is complicated when he saves a local fisherman's daughter from a shark attack and romantic feelings surface between them....says THIS ARTICLE in Hollywood Reporter. So, I got caught in something of a 'Geek Loop' when trying to come up with other famous amphibians. A friend's telling me that...to beamphibian...four legs and cold blood are required. But I always kinda considered the ability to live under water as well as on land the 'geek' definition of amphibious, thus encompassing: Costner in WATERWORLD, that DeLuise dude in SeaQUEST, Aqua Man, Patrick Duffy in THE MAN FROM ATLANTIS...