Everyone laughs when Horton the Elephant offers to sit on Mayzie bird's egg while she goes on holiday. Horton, with his big heart and unwavering kindness, decides to take on this task without hesitation. However, his journey is far from easy. When he and the egg are kidnapped and sold to a circus, his kindness and faithfulness are put to the ultimate test. The circus environment is harsh and unfamiliar, but Horton refuses to give up on the egg or his promise to Mayzie.
Despite the challenges and difficulties he faces, Horton remains true to himself. He endures the ridicule and abuse from the other circus animals, but his determination never wavers. And finally, his faithfulness is rewarded in a way that is more wonderful than he could ever have dreamed. The egg hatches, and out comes a little elephant-bird hybrid that is loved and cherished by all. Horton's kindness and faithfulness have paid off, and he has learned an important lesson about the power of keeping one's word and following through on one's commitments.