A few seconds of flashing red and blue light turned an ordinary Pokémon episode into a nationwide medical emergency. This is how 685 viewers were taken to hospitals, Porygon inherited the blame and Pikachu kept its job as the franchise mascot.
At 6:51 p.m. on December 16, 1997, Pikachu fired a Thunderbolt at several incoming missiles. Within minutes, emergency calls began coming in across Japan.
No Team Rocket plan had ever landed like this. The 38th episode of Pokémon, “Dennō Senshi Porygon”—commonly translated as “Electric Soldier Porygon”—aired once, triggered a national medical emergency and disappeared. Porygon’s name remained attached to the scandal, although the episode itself points toward a much more famous suspect.
The Explosion in Cyberspace
The story sends Ash, Misty, Brock and Pikachu inside a computerized Poké Ball transfer network. An antivirus program mistakes them for intruders and launches missiles in their direction. Pikachu destroys them, producing an explosion rendered through rapidly alternating red and blue frames.
Animators used a technique called paka-paka to make the digital blast feel electrically violent. Mission accomplished. The colors flashed at roughly 12 cycles per second, filling television screens in an estimated 4.6 million households. Some viewers immediately experienced blurred vision, headaches, nausea and dizziness. Others convulsed, lost consciousness or suffered photosensitive seizures.
Pikachu had not somehow transmitted epilepsy through Japanese television. Rapid, high-contrast flashes can provoke seizures in susceptible people, particularly children and adolescents. The episode had simply delivered an unusually aggressive visual trigger to an enormous young audience.
685 Ambulance Rides
Japan’s Fire and Disaster Management Agency counted 685 viewers—310 males and 375 females—transported by ambulance to hospitals. Most were children, although the patients were not exclusively minors. Many recovered on the way; 208 were admitted, and two remained hospitalized for more than two weeks.
Those distinctions were swallowed whole once “Pokémon Shock” became an international headline. Around 12,000 additional children later reported milder symptoms, with researchers arguing that media coverage and mass psychogenic illness contributed to this second wave. That does not mean anyone was pretending: anxiety can produce very real physical reactions and spread them through a frightened group.
Some news programs nevertheless decided to replay the flashing footage while explaining why nobody should watch it. Journalism briefly became its own Team Rocket operation.
Porygon Gets a Life Sentence
TV Tokyo apologized, suspended the series and permanently pulled the episode. Police questioned the producers, Nintendo’s shares dropped and the anime remained off Japanese television for nearly four months. New broadcasting guidelines restricted dangerous flashing patterns and helped turn warnings about watching anime in a well-lit room into a familiar ritual.
“Electric Soldier Porygon” has never been officially rebroadcast. Porygon and its evolutions were also effectively exiled from the anime, serving a decades-long sentence for an explosion they did not cause. Pikachu, whose attack detonated the missiles, remained the franchise mascot.
In 2020, Pokémon’s official Twitter account briefly posted, “Porygon did nothing wrong.” The message was deleted soon afterward.
Pikachu kept his job.