Superstar genetic engineers Clive (Adrien Brody) and Elsa (Sarah Polley) specialize in splicing DNA from different animals to create incredible new hybrids. Now they want to use human DNA in a hybrid that could revolutionize science and medicine. But when the pharmaceutical company that funds their research forbids it, Clive and Elsa secretly take their boldest experimentation underground-risking their careers by pushing the boundaries of science to serve their own curiosity and ambition. The result is Dren, an amazing, strangely beautiful creature of uncommon intelligence and an array of unexpected physical developments.