Dory is a major character in the 2003 Pixar animated film 'Finding Nemo'. She is a blue tang fish who suffers from short-term memory loss and is voiced by Ellen DeGeneres. DORY is a loyal and helpful friend to Marlin, the clownfish searching for his son Nemo. She helps Marlin on his journey to find Nemo and eventually reunites him with his son. DORY's optimism and determination are key to the success of their mission.