An episode of the anime called "Dennō Senshi Porygon" ("Electric Soldier Porygon" in the United States) was first shown in Japan on December 16, 1997. One part of the episode showed quickly flashing red and blue lights. This caused 685 Japanese children to have epileptic seizures. Because of this, the anime went on a four-month break, and several laws were put in place regarding the flashing lights.