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Pages from the pitch bible for "The Patakis", a rejected spin-off of "Hey Arnold!" that was planned to air on Nick At Nite. [2000]

This previously unseen material was leaked via 4chan's /co/ board, and is currently backed up on https://t.co/tYMzpmkzCr.

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Various pieces of production artwork from "The Angry Beavers", drawn by Michael Q. Ceballos. [1997-98]

Early concept posters for "The SpongeBob SquarePants Movie", drawn by David Christensen. [2004]

The team, known as "SpongeBot SquareTeens" won the '05 race. The car was later sold on Ebay, signed by Rob Renzetti, Stephen Hillenburg, and Tom Kenny, with all proceeds going to charity.

Below is the team's logo, along with their '04 car with the "Dora the Explorer" crew. [2/2]

Print ad for the SpongeBob SquarePants "You Wish" special event. [2001]

Viewers could call in during the episode "Shanghaied" to vote on 1 of 3 possible endings, with the winner being the permanent ending for all future reruns/releases of the episode.

@CaeDios tried to join, but it keeps disconnecting sadly, so I doodled this as a compromise lol. I really enjoy seeing your SpongeBob art and posts on my timeline, keep it up! :)

Various pieces of concept art for the "KaBlam!" series, "Sniz and Fondue", back when it was known as "Psyched For Snuppa". Drawn by [presumably] Mike R. Brandon. [1991-92]

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Concept art of even more original monster ideas.

Sadly, "The Pets of Frankenstein" Line was rejected, but most of the designs were incorporated into the line Mattel released, only slightly redesigned to fit within the shows style.

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Concept art of some more original monster ideas.

Infamously, the line of toys that WAS released by Mattel were originally pitched by Mel as "The Pets of Frankenstein", an original series of monster toys with quirky gimmicks.

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Concept art for toys of The Snorch & Zimbo, along with some original monster designs made to fit within the shows style.