1970s children's animation adapted from the book by Dr. Seuss. A one-time industrialist named the Once-ler, whose business is now in ruins, recounts his story to a young boy. He explains how he developed his fashion business by selfishly cutting down Truffula Trees, which produce coloured material, for his own needs without considering the affect it would have on the environment, despite the cautionary advice he was given from the wise Lorax.