Soon, Peter was invited to attend a demonstration by a man named Otto Octavius. He has built a series of four mechanical arms. He says that the arms can control him, but because of a special mental chip on his back, he can control them instead of the other way around. He uses the arms to allow him to build and touch a reactor that uses energy from the sun. The reactor is powered by tritium. Tritium is very rare and costly, so Harry Osborn and his company spend their money to provide him with the product. However, a paper clip gets into the machine and causes massive damage. Otto's wife is killed. Peter dons the Spider-Man costume and rescues his friend Harry Osborn. Harry is mad because he hates Spider-Man since he thinks that Spider-Man killed his father (back in the first movie). The accident causes Otto's mechanical arms to fuse to his body, and it also destroyed the chip that allows him to control his arms. The loss of his wife makes him go crazy. The arms start forcing him to build the machine again to get revenge, but say they needed money in order to do it. Now called Doc Ock by the press, Otto attempts to rob a bank vault for cash, but is foiled by Spider-Man in the process.