In a tropical jungle called Ono, the little elephant Horton (voiced by Jim Carrey) and his friends live freely here. One day, a speck of dust broke into Horton's world. When the dust passed in front of him, he seemed to hear a faint cry for help. After a hectic chase, Horton finally found the speck of dust on a flower. It turned out that there was a "nameless town (Huhu Town)" on the dust. The local people originally lived in peace and peace, but a falling fruit knocked the dust where the "nameless town" was located from the clover stamen into the sky. This incident caused many strange things to happen in the "nameless town" that was about to celebrate its centenary. By chance, the mayor of the town, Mai Duoduo, and Horton got in touch. In order to restore the town to a stable state, Horton decided to take them back to the original world... This film is adapted from the novel of the same name by Dr. Seuss.