What was the Japanese title of the Pokémon anime episode linked to the 1997 TV seizure incident?

The Pokémon anime episode linked to the 1997 television seizure incident was titled Dennō Senshi Porygon.

It was the 38th episode of the first Pokémon season and aired only once in Japan, on 16 December 1997. A scene involving rapid red and blue flashing during an explosion was followed by reports of photosensitive seizures and other symptoms among viewers, many of them children.

More than 600 people were taken to hospitals after the broadcast. The incident became known in Japan as the Pokémon Shock and led to a four-month hiatus for the anime. Dennō Senshi Porygon was removed from circulation and was not broadcast in other countries.

Despite the episode’s title, Pikachu’s attack created the flashing sequence that became the focus of reports; Porygon was not the source of the visual effect. The event also influenced later television-production and broadcasting safety practices in Japan.