TV series: 4KIDS/Nintendo and VIZ
Movies: 4KIDS/Nintendo and Warner Brothers

TV series: Video release of TV series (which had the attacks toned down to avoid the seizures caused by the orignal TV episodes)
Movies: Original theatrical release

Some edits (video/dialog/name changes) were done to remove the series from its Japanese setting (although not *IN* Japan, various cultural elements of Japan were identifiable in the original). Other edits (skipped episodes/dialog changes) removed objectionable material. Movie 1 events and characters were widely changed due to the editing and alterations done to the first movie.

The following episodes were skipped and never shown in North America:

Japanese episode 18 - Holiday at Acapulco (recently this epsiode was shown as an 'Lost Episode', although it was heavily edited)
Japanese episode 35 - The Legend of Dratini
Japanese episode 38 - Electric Soldier Porygon

Overlays were used to cover Japanese characters.

Various electrical attacks were altered and toned down to avoid causing the seizures casued by the original animation when it first aired on TV in Japan (the Japanese video release was reportedly similarly edited).

In addition to name changes, there were changes to jokes and to hide the fact that the show was taking place in a Japanese setting (riceballs became donuts, for example).

Here are some of the names that were changed:

Some of the monster's names were also changed, but I do not currently have access to a list of them.

• Currently the only way to get the complete and uncut Poket Monsters (TV series and movies) is by obtaining an import version from Japan (should be available on SVHS from various sources). Episode 38 (the seizure episode) apparently is not available on home video in Japan either.