Näitlejad

• Danny Cooksey — Brett / Chet (voice)
• Sherry Lynn — Additional Voices (voice)
• Nasim Pedrad — Once-ler's Mom (voice)
• Stephen Tobolowsky — Uncle Ubb (voice)
• Zac Efron — Ted Wiggins (voice)
• Ed Helms — Once-ler (voice)
• Bob Bergen — Additional Voices (voice)
• Danny DeVito — The Lorax (voice)
• Taylor Swift — Audrey (voice)
• Rob Riggle — Mr. Aloysius O'Hare (voice)
• Jenny Slate — Mrs. Wiggins (voice)
• Betty White — Grammy Norma (voice)
• Willow Smith — Marta (voice)
• Joel Swetow — 1st Marketing Guy (voice)
• Michael Beattie — 2nd Marketing Guy (voice)
• Dave B. Mitchell — 1st Commercial Guy (voice)
• Dempsey Pappion — 2nd Commercial Guy (voice)
• Elmarie Wendel — Aunt Grizelda (voice)
• Chris Renaud — Forest Animals (voice)
• Jack Angel — Additional Voices (voice)
• Debi Derryberry — Additional Voices (voice)