An alien is sent to Earth by the United Nations to learn about gardening from a human, but cannot speak the human's language. The alien likely already has preconceptions about Earth's plant life from television broadcasts that have reached deep into space. Plants have often been portrayed as threatening or dangerous in movies, such as in Little Shop of Horrors, Attack of the Killer Tomatoes, Day of the Triffids, and Batman & Robin, where Poison Ivy was a villain who could control plants.