Dennō Senshi Porygon

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"Dennō Senshi Porygon"
Pokémon episode
In one of the scenes believed to have caused epileptic seizures, Pikachu uses a "Thunderbolt" attack on a cyber missile, making the screen flash red and blue rapidly.
Episode no.Season 1
Episode 38
Directed byKiyotaka Isako
Written byJunki Takegami
Production code138
Original air dateDecember 16, 1997 (1997-12-16)
Episode chronology
← Previous
"Ditto's Mysterious Mansion"
Next →
"Pikachu's Goodbye"
List of episodes

"Dennō Senshi Porygon" (Japanese: でんのうせんしポリゴン, Hepburn: Dennō Senshi Porigon, translated as "Computer Warrior Porygon", although more commonly "Electric Soldier Porygon") is the 38th episode of the Pokémon anime's first season. Its sole broadcast was in Japan on December 16, 1997.

In the episode, Ash and his friends find that there is something wrong with the Poké Ball transmitting device at the local Pokémon Center. To find out what is wrong, they must go inside the machine.

The episode contained repetitive visual effects that induced photosensitive epileptic seizures in a substantial number of Japanese viewers, with more than 600 children across Japan taken to hospitals. Additionally, the shares of Nintendo, the company that produced the games they were based on, significantly fell. The incident is referred to in Japan as the "Pokémon Shock" (ポケモンショック, Pokemon Shokku).

As a result of the incident, the episode was pulled from rotation and it has not aired in any country since. After the incident, the Pokémon anime went into a four-month hiatus. Since then, the episode has been parodied and referenced in cultural media.


Ash, Misty, Brock and Pikachu make their way to the nearest Pokémon Center, where they discover that the Poké Ball transmitting device is malfunctioning. On Nurse Joy's request, they go to Professor Akihabara, the one who created the Poké Ball transfer system. He tells them that Team Rocket stole his prototype Porygon, a digital Pokémon that can exist in cyberspace, and is using it to steal trainers' Pokémon from inside the computer system.

Akihabara sends Ash, Misty, Brock, Pikachu and his second Porygon into the cyberspace system, using his Dimension Transporter, to stop Team Rocket, whom they learn have set up a blockade that stops Pokéballs from traveling the network. Porygon is able to defeat Team Rocket's Porygon; unfortunately, Nurse Joy, monitoring the situation and unaware that Ash and the others are inside, has sent an antivirus program into the system to combat the computer virus Team Rocket set up. In the ensuing chaos, Pikachu uses a Thunderbolt attack on the program, which manifests as 4 cyber missiles, which causes a large explosion. Two of the missiles enter the portal, completely destroying Akihabara's house, much to his dismay, as his Dimension Transporter is now broken. The group and Team Rocket successfully escape the computer, and with Team Rocket's blockade removed, the Poké Ball transmitting device returns to normal.


"Dennō Senshi Porygon" had its sole broadcast in Japan on Tuesday, December 16, 1997,[1] at 6:30 PM Japan Standard Time (09:30 UTC).[2] It was broadcast over 37 TV stations that Tuesday night. It held the highest ratings for its time slot,[2] and was watched by approximately 4.6 million households.[3][4]

Strobe lights[edit]

A slowed-down version of the effect that caused seizures among the viewers of the episode.

Twenty minutes into the episode, Pikachu stops "vaccine" missiles with his Thunderbolt attack, resulting in an explosion that flashes red and blue lights.[1][5] Although there were similar parts in the episode with red and blue flashes, two anime techniques, called "paka paka"[a] and "flash",[b] made the scene particularly intense.[2] These flashes were bright strobe lights, with blinks at a rate of about 12 Hz for approximately six seconds.[6]

At this point, some of the viewers experienced blurred vision, headaches, dizziness and nausea.[1][5][7] Some suffered seizures, blindness, convulsions and unconsciousness.[1][5] Japan's Fire Defense Agency reported that 685 viewers – 310 boys and 375 girls – were taken to hospitals by ambulances.[5][8] Although many victims recovered during the ambulance trip, more than 150 were admitted to hospitals.[5][8] Two were hospitalized for more than two weeks.[8] The incident was referred to as "Pokémon Shock" (ポケモンショック, Pokémon Shokku) by the Japanese press.[9]

Later studies showed that 5–10% of the viewers had mild symptoms that did not need hospital treatment.[6] Twelve thousand children who were not sent to hospital reported mild symptoms of illness; however, their symptoms more closely resembled mass hysteria than a seizure.[5][10] A study following 103 patients over three years after the event found that most had no further seizures.[11] Although approximately 1 in 4,000 people are susceptible to these types of seizures, the number of people affected by the Pokémon episode was unprecedented.[1][8]

Shortly after the incident, speaking to USA Today, Mike Lazzo, vice president of programming for the Cartoon Network, reassured parents that American children were unlikely to suffer seizures provoked by cartoons as U.S. networks at the time rarely aired anime, which he argued was substantially different to animation aired on Cartoon Network.[12] In early January 1998, 4Kids Entertainment announced that they intended to air Pokémon in the U.S., albeit ensuring that the flashing effects were removed.[13] Electronic Gaming Monthly suggested that without the publicity around the seizures, Pokémon may have never been localized to the U.S.[13] Pokémon successfully premiered in the U.S. (without this episode) in September 1998, with more children's anime airing on broadcast and cable networks in the U.S. immediately afterwards.[citation needed]


The incident resulted in TV Tokyo and other broadcasters establishing a series of guidelines for animated programs in Japan and other territories.

The following day, the television station that had originated the lone broadcast of that episode, TV Tokyo, issued an apology to the Japanese public, suspended the program, and said it would investigate the cause of the seizures.[5] Video retailers all over Japan removed the Pokémon anime from their rental shelves.[5] Officers from Atago police stations were ordered by Japan's National Police Agency to question the anime's producers about the show's contents and production process.[2] An emergency meeting was held by the Ministry of Health, Labour and Welfare, in which the case was discussed with experts and information collected from hospitals.[citation needed] On the Tokyo Stock Exchange, shares in Nintendo (the company that publishes the games that the anime is based on) fell by 400 yen the following morning to 12,200 yen (almost 3.2%).[5][14] The president of Nintendo, Hiroshi Yamauchi, said at a press conference the day after the episode had aired that the video game company was not responsible since the original Pokémon game for its Game Boy product was presented in black and white.[14]

After the airing of "Dennō Senshi Porygon", the Pokémon anime went into a four-month hiatus. Its time slot was taken over by Class King Yamazaki [ja] (学級王ヤマザキ).[citation needed] All 37 episodes of Pokémon: Indigo League were rerun on Kids Station in Tokyo leading up to the show's return on April 16, 1998, with airing of "Forest of Pikachu" ("Pikachu's Goodbye") and "The Four Eevee Brothers" ("The Battling Eevee Brothers").[15][16] After the hiatus, the time slot changed from Tuesday to Thursday.[3] Several episodes (including the opening, credits, and "Dare da?" segments) were heavily edited to reduce flashing lights (with special emphasis on lightning that consumes the screen).[citation needed] Before broadcasting resumed, the special program "Problem Inspection Report on the Pocket Monsters Anime" (アニメ ポケットモンスター問題検証報告, Anime Poketto Monsutā Mondai Kenshō Hōkoku) was shown. Broadcast in Japan on April 16, 1998, host Miyuki Yadama went over the circumstances of the program format and the on-screen advisories at the beginning of animated programs, as well as showing letters and fan drawings sent in by viewers, most of whom were concerned that the incident would lead to the anime being cancelled.[3]

Many Japanese television broadcasters and medical officials (along with the United Kingdom's Independent Television Commission[17]) came together to find ways to make sure the incident was not repeated. They established a series of guidelines for future animated programs,[8][18] including that flashing images, especially those with red, should not flicker faster than three times per second; if the image does not have red, it still should not flicker faster than five times per second; flashing images should not be displayed for a total duration of more than two seconds; and stripes, whirls and concentric circles should not take up a large part of the television screen. The Harding test for content that now airs on Japanese TV and streaming sites ensures no more than one flashing light occurs every 10 frames, reproduced at 29.97 FPS, where "flashing lights" are classified as extreme changes in colors from one frame to the next. Footage may either clear or fail checks, or "pass with a warning" in which case the video's luminance is automatically adjusted to mitigate potential effects.

The episode "Rougela's Christmas" ("Holiday Hi-Jynx"), which would have aired the following week, December 23, 1997, was pulled following the incident, and would not air until October 5, 1998. Airing out of order caused confusion to viewers because Ash still had a Charmander instead of Charizard, and Misty did not have Togepi yet, but Starmie and Horsea. Also, a New Year special that would have aired on December 30, 1997, was pulled and never resurfaced.[citation needed]

To prevent any similar incidents from occurring, the episode was pulled from rotation, and it has not aired since in any country.[1] After the incident, TV broadcasters voluntarily added on-screen warnings to shows targeted at young children encouraging viewers to watch anime in a well-lit room and to sit far away from the television set.[19] The anime has not featured Porygon or its evolutions, Porygon2 and Porygon-Z, in any subsequent episodes outside of brief cameos, despite Pikachu being the one to cause the seizure-inducing strobe effect.[20]

Cultural impact[edit]

The "Pokémon Shock" incident has been parodied many times in popular culture, including a 1999 episode of The Simpsons, "Thirty Minutes over Tokyo". In the episode, Bart watches an anime entitled Battling Seizure Robots featuring robots with flashing eye lasers, and asks: "Isn't this that cartoon that causes seizures?" The flashing eyes cause him, Marge, Lisa, and Homer to have seizures. The same scene is seen again in the episode's end credits, this time covering the entire screen.[16]

An episode of South Park, "Chinpokomon", revolves around a Pokémon-like phenomenon, called Chinpokomon. Chinpokomon toys and video games are sold to children in South Park by a Japanese company. The company's president, Mr. Hirohito, uses the toys to brainwash the American children, making them into his own army to topple the "evil" American "empire". These toys included a video game in which the player attempts to bomb Pearl Harbor. While playing this game, Kenny has an epileptic seizure and later dies.[16]

The incident was included in the 2004 edition and the 2008 Gamer's Edition of the Guinness World Records book, holding the record for "Most Photosensitive Epileptic Seizures Caused by a Television Show".[21][22]

In So Yesterday, a 2004 novel by Scott Westerfeld, this episode is mentioned and shown to one of the characters. The flashing red light that caused the seizure is also used in the storytelling elements.[23][non-primary source needed]

On September 19, 2020, the official Pokémon Twitter account referenced the episode, saying "Porygon did nothing wrong,"[24] in reference to the resulting explosion from Pikachu's Thunderbolt attack being the in-universe cause of the flashing lights, not Porygon.[25] The tweet was deleted shortly thereafter, speculated to be because of the taboo subject matter.[26][27]

See also[edit]


  1. ^ The anime technique "paka paka" uses different-colored lights flashing alternatively to cause a sense of tension.[2]
  2. ^ The anime technique "flash" emits a strong beam of light.[2]


  1. ^ a b c d e f Plunkett, Luke (February 11, 2011). "The Banned Pokémon Episode That Gave Children Seizures". Kotaku. Archived from the original on May 15, 2013. Retrieved September 11, 2014.
  2. ^ a b c d e f Wudunn, Sheryl (December 18, 1997). "TV Cartoon's Flashes Send 700 Japanese Into Seizures". The New York Times. Archived from the original on March 8, 2016. Retrieved August 9, 2020.
  3. ^ a b c ポケモン騒動を検証する (in Japanese). TVアニメ資料館. Archived from the original on January 13, 2008. Retrieved August 9, 2020.
  4. ^ "An Interim Report on the Display Techniques in Celluloid Animtion as studied from the Medical Point of View". Ministry of Internal Affairs and Communications. April 1998. Archived from the original on November 4, 2002. Retrieved November 2, 2008.
  5. ^ a b c d e f g h i Radford, Benjamin (May–June 2001). "The Pokémon Panic of 1997". Skeptical Inquirer. Vol. 25, no. 3. pp. 26–31. Archived from the original on January 25, 2002. Retrieved November 2, 2008.
  6. ^ a b Takahashi, Takeo; Tsukahara, Yasuo (1998). "Pocket Monster incident and low luminance visual stimuli". Pediatrics International. Blackwell Science Asia. 40 (6): 631–637. doi:10.1111/j.1442-200X.1998.tb02006.x. ISSN 1328-8067. OCLC 40953034. PMID 9893306. S2CID 19236421. Archived from the original on December 8, 2012. Retrieved November 2, 2008.
  7. ^ "Japanese cartoon triggers seizures in hundreds of children". CNN. December 17, 1997. Retrieved August 9, 2020.
  8. ^ a b c d e "Pokémon on the Brain". Neuroscience For Kids. March 11, 2000. Retrieved November 21, 2008.
  9. ^ Papapetros, Spyros (2001). On the Animation of the Inorganic: Life in Movement in the Art and Architecture of Modernism, 1892–1944. Berkeley, California: University of California. OCLC 51930122.
  10. ^ Radford, Benjamin; Bartholomew, Robert (2001). "Pokémon contagion: photosensitive epilepsy or mass psychogenic illness?". South Med J. 94 (2): 197–204. doi:10.1097/00007611-200194020-00005. PMID 11235034.
  11. ^ Ishiguro, Yoshiko; Takada, Hiroyuki; Watanabe, Kazuyoshi; Okumura, Akihasa; Aso, Kosaburo; Ishikawa, Tatsuya (April 2004). "A Follow-up Survey on Seizures Induced by Animated Cartoon TV Program "Pocket Monster"". Epilepsia. Copenhagen: E. Munksgaard. 45 (4): 377–383. doi:10.1111/j.0013-9580.2004.18903.x. ISSN 0013-9580. OCLC 1568121. PMID 15030500. S2CID 32309680.
  12. ^ Graham, Jefferson; Friend, Tim (December 18, 1997). "U.S. Kids Safe From Cartoon Seizures??". USA Today. Archived from the original on August 20, 2000.
  13. ^ a b "Invasion of the Seizure-inducing Cartoons". Electronic Gaming Monthly. No. 104. Ziff Davis. March 1998. p. 34.
  14. ^ a b "Popular TV cartoon blamed for mass seizures". Virtual Pet. The Asahi Shimbun. December 17, 1997. Retrieved November 3, 2008.
  15. ^ Phillips, George (March 27, 2007). "10th Anniversary of Pokémon in Japan". Anime News Network. Retrieved October 18, 2008.
  16. ^ a b c Hamilton, Robert (April 2002). "Empire of Kitsch: Japan as Represented in Western Pop Media". Bad Subjects. Archived from the original on September 27, 2011. Retrieved October 18, 2008.
  17. ^ Faught, Edward (September 2004). "Attack of the Pocket Monsters: No Lasting Effects". Epilepsy Currents. 4 (5): 198–199. doi:10.1111/j.1535-7597.2004.04511.x. PMC 1176371. PMID 16059499. The Pokemon incident also resulted in modification in television broadcast standards in Japan and the United Kingdom, based on a detailed analysis of the culpable features of the visual stimulus.
  18. ^ "Animated Program Image Effect Production Guidelines". TV Tokyo. Retrieved November 21, 2008.{{cite web}}: CS1 maint: url-status (link)
  19. ^ Sevakis, Justin (June 21, 2017). "Answerman - What Happened To The 'Watch This Program In A Well-Lit Room' Warnings?". Anime News Network. Archived from the original on June 21, 2017. Retrieved August 14, 2017.
  20. ^ Innes, Kenneth. "Character Profile: Porygon". Absolute Anime. Archived from the original on June 1, 2009. Retrieved November 21, 2008.
  21. ^ Menon, Vinay (August 25, 2004). "Records: The biggest load of ...". Toronto Star. p. F04.
  22. ^ Clodfelter, Tim (April 17, 2008). "Record Book Focused on the Gamers". Winston-Salem Journal. p. 1.
  23. ^ Westerfeld, Scott (September 8, 2005). So Yesterday. Razorbill. ISBN 1595140328.
  24. ^ The Pokémon Company International [@Pokemon] (September 19, 2020). "Porygon did nothing wrong" (Tweet). Archived from the original on September 19, 2020. Retrieved December 9, 2020 – via Twitter.
  25. ^ Harding, Daryl (September 20, 2020). "The Pokémon Company Finally Concedes Porygon's Innocence After 23 Years". Crunchyroll. Archived from the original on October 21, 2020. Retrieved December 9, 2020.
  26. ^ Dwyer, Theo (September 23, 2020). ""Porygon Did Nothing Wrong" Says Official Pokémon Twitter". Bleeding Cool. Archived from the original on September 26, 2020. Retrieved December 9, 2020.
  27. ^ Wang, Tiffany (September 19, 2020). "Pokémon's Official Twitter Jokes About Infamous Seizure Episode". Screen Rant. Archived from the original on September 24, 2020. Retrieved December 9, 2020.

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