List of studios that produces Greeny Phatom

If you count the changes of animation, that is animation outsourcing and just making the episodes with MS Paint and Movie Maker.

Studios

 * TMS Entertainment (location: Nakano, Nakano-ku, Tokyo, Japan, used from 1998 until 2004)
 * Zagreb School of Animated Films (location: Zagreb, Croatia, used on and off since 1995)
 * Klasky-Csupo, Inc. (location: Hollywood, California, USA, used until 2007 where they were let go over a pay dispute)