A computer chip from the U.S. Department of Defense is missing, containing high-level secrets. International criminals have also speculated its price to astronomical figures. In order to complete the transaction, the criminals hid it in a toy remote-controlled car and successfully passed airport security. However, on the way, it was accidentally switched by an old lady. Finally, the remote-controlled car with hidden high-level secret chips was sent to the 8-year-old boy Alex D. Linz. Linz) in the hands. In order to retrieve the chip, professionally trained criminals sneaked into the community where Alex lived. One night, Alex was left alone at home because of chickenpox, which gave the criminals a great opportunity. However... Alex was not the 8-year-old boy they imagined. He had unexpected "weapons" and finally defeated the criminals with wisdom. Since the minor lead role of the previous two films, McAulikkin, had grown up when the third film started filming, the new minor lead role, Alex D. Linz, was used in the third film.
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