Once-Ler

The Once-Ler is a man who discovered The Lorax's homeland the Truffula Forest. He is responsible for chopping down the Truffula Trees and turning them into objects called Thneeds. The Once-Ler also served as an old friend of Timothy Mrs. Brisby Bianca and Bernard.

The Once-Ler debuted in the fourth season and later returned in the fifth season of The Chronicles of Thorn Valley. In the prequel series Rescuers Chronicles - The Once-Ler and The Lorax joined forces with Bernard to prevent Ratigan from kidnapping Bianca.