ALVINNN!!! and the Chipmunks 2015 Episode 15 The Tree House - 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.