The Zookeeper (S01E07)

Feeling confined within his home, Mr. Benn ventures to the costume shop in search of adventure. The shopkeeper presents him with a blue uniform and hat, prompting Mr. Benn to ponder his new role. Upon stepping through the changing room door, he finds himself at a zoo and quickly realizes he must be the zookeeper. However, he discovers that the animals are unhappy due to their cramped cages. A parrot explains their plight, leading Mr. Benn to devise a plan to help the visitors understand what it's like to be imprisoned in a cage.