Dory is a Regal Blue Tang that Marlin collides with while pursuing the boat that is carrying his son, Nemo. Dory suffers from short-term memory loss. Dory accompanies Marlin in his search for his son, and her lack of short-term memory provides much of the film's comic relief. Dory's optimism and her free spirit help Marlin throughout his journey. Dory has a sunny point of view over everything in life. She eventually becomes Marlin's best friend. Dory's name comes from the common name of several families of marine fish, most of which are in the order Zeiformes, suborder Zeioidei. Voiced by Ellen DeGeneres.