Mjärt Mart has a rat infestation problem, as the vermin only discourage customers from shopping and trigger Mr. Mjart's severe allergies. However, when Pickle and Peanut have a hard time getting the rats to leave the store, they come up with an interesting solution that can keep them in the store; dressing the rats up as small lovable farm animals and opening a 'petting zoo' in the middle of the store. Surprisingly, this turns out to be successful and even draws in more customers, but the two soon realize with the rats still in the store, Mr. Mjart's allergic reactions to them will only get worse. With that, they decide to find another place to send the rats instead, where local crime boss Papa provides them with a potential new home in his own zoo, as he is interested in the rats for his own mysterious intentions.