A computer chip from the U.S. Department of Defense is missing, containing high-level secrets. International criminals also charge astronomical prices. In order to complete the transaction, the criminal hid it in a toy remote control car and successfully passed the airport security check. However, on the way, it was accidentally transferred by an old lady, and eventually the remote-controlled car with a high-level secret chip was delivered to the hands of an 8-year-old boy Alex (Alex D. Linz). In order to retrieve the chip, professionally trained criminals infiltrated the community where Alex lived. One night, Alex is left home alone with chickenpox, giving criminals a huge opportunity. However... Alex was not the 8-year-old boy they imagined. He had unexpected "weapons" and finally defeated the criminals with his wisdom. Since Macaulay Culkin, the minor protagonist of the previous two films, had grown up when filming of the third film began, the third film used a new minor protagonist, Alex D. Linz.
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