The Tree House - Saving Simon.The Tree House: The Chipettes reminisce how they came to live in their tree house: some time before, they lived at the Seville home with the Chipmunks, but played all the time in the neighbor's tree. However, the neighbor tried to poison it to have it chopped down, but Jeanette, who loved the tree, started living in it so that a local law would have it protected because of the tree constituting a habitat. After some conflict, the neighbor finally just gave up and moved out of town, while the Chipettes moved into the tree permanently.
Saving Simon: The Chipmunks and Chipettes believe that Simon is leaving permanently for a science institute, so they devise a plan to stop him from leaving: stealing his clothes, hiding his communication devices and sabotaging Dave's car, before locking Simon up in his closet to allow Alvin to take his place and ruin his interview with the science institute's envoy. Everything goes according to plan, but it is revealed that Simon was just leaving for summer camp, so everyone ends up having to apologize to him.