The Alien (エイリアン) is a supporting character in Dōbutsu no Mori. He appears in the movie's final act. Upon finding two components for Gulliver's U.F.O., one of the components reveals itself to be Alien, a sentient being. The Alien thanks Ai for her selflessness and reunites with his family.
The alien is very simplistic in design, being nothing more than a black blob with three stubs attached to its bottom. To make up for its simplicity, however, the alien is very malleble, having the ability to shapeshift its body into different forms, including Ai's face.