Animal Crackers 2 (1970)

Owen and Zoe, the circus owners, leave their daughter Mackenzie and their circus in the hands of Chesterfield the Clown to secure a global cookie distribution deal — and chaos ensues. Mackenzie turns into a monkey during her high-wire act, losing her human form and her magic cookie. In a desperate attempt to save her, the entire circus embarks on a quest to find the source of magic that can reverse the transformation and bring Mackenzie back to her family.