Codename: Kids Next Door (scrapped episodes)
Codename: Kids Next Door was a popular Cartoon Network series which ran from 2002 to 2008 for six seasons, two specials, and a TV movie. There were a few episodes that were heavily retooled or scrapped entirely.
A parody of Dr. Seuss's The Lorax, right down to the art style and rhyming dialogue. It was so similar to the classic Dr. Seuss style that the creator, Mr. Warburton, had to get permission from Theodore Geisel's estate. They declined, and the episode was scrapped. A script was posted on the now defunct Kids Next Door production blog, but it has since disappeared.
This was originally a 22-minute Thanksgiving special that was likely canned due to lack of international appeal. The plot involved Numbuh 3's younger sister, Mushi, bringing to life Thanksgiving turkeys to spank Numbuh 2 as punishment for catching her sabatoging one of Numbuh 3's dolls in a previous episode. This was later re-tooled into a standard 11-minute episode known as Operation: S.P.A.N.K.E.N.S.T.E.I.N.. The entire script was available for download as a PDF on the blog but as since vanished.
This was an early name for Operation: D.A.D.D.Y. One major difference is that this had a flashback of Numbuh 1 before he lost his hair. Storyboards were on the blog, but are now gone.