Double Trouble / Liar Liar.Double Trouble: Alvin breaks into Simon's hidden saferoom in their room and runs into an invention which accidentally creates a clone of himself. However, the clone proves to be ignorant and destructive and soon ruins Alvin's life. In the end, the clone creates an army of copies of himself with the invention and just as the clones are about to overrun the Chipmunks, Alvin wakes up, revealing that he was just dreaming.
Liar Liar: Dave and Alvin help a man with a flat tire, but during this time Alvin makes up a lie that he has an older brother who is racing in China. This starts a chain reaction where Dave, Alvin and then Simon and Theodore have to cover up for each other as the lie becomes bigger and bigger and spreads at school. In the end, Miss Smith just summons everyone at school and slams Dave for sending the wrong message to his sons.