- Pingu Runs Away: Pingu Runs Away was deemed controversial due to its offensive scenes (including Mother spanking Pingu and Pingu running away from home). As a result, Pingu Runs Away was placed under unofficial ban from broadcast or video distribution from the US by The Pygos Group and other rights-holders and broadcasters (including Turner Broadcasting and HiT Entertainment). Also, the episode contains dark, frightening images that have scared many young viewers. Due to the upsetting themes in this episode also, it was removed from British television in 2005. This was also one of the few episodes pulled from Cartoon Network and Sprout due to its offensive material.
- Computer Warrior Porygon: "Dennō Senshi Porygon", literally "Computer Warrior Porygon", but fans refer to it as "Electric Soldier Porygon", aired on TV Tokyo in Japan on December 16, 1997 at 6:30 PM Japan Standard Time. This episode was claimed to be dangerous for health. 20 minutes into the episode, there is a scene in which Pikachu stops some vaccine missiles with its Thunderbolt attack, resulting in a huge explosion that flashes red and blue lights. Although there were similar parts in the episode with red and blue flashes, an anime technique called "paka paka" made this scene extremely intense, for these flashes were extremely bright strobe lights, with blinks at a rate of about 12 Hz for about 4 seconds in almost fullscreen, and then for 2 seconds outright fullscreen.
At this point, viewers started to complain of blurred vision, headaches, dizziness and nausea. A few people even had seizures, blindness, convulsions, and lost consciousness. Japan's Fire Defense Agency reported a total of 685 viewers, 310 boys and 375 girls, were taken to hospitals by ambulances. Although many victims recovered during the ambulance trip, more than 150 of them were admitted to hospitals. Two people remained hospitalized for over 2 weeks. Some other people had seizures when parts of the scene were rebroadcast during news reports on the seizures. Only a small fraction of the 685 children treated were diagnosed with photosensitive epilepsy.