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Creator Backlash: According to Milton Knight, many of the staffers openly despised working on this show. Knight himself enjoyed working on it, but found the animation, writing, and most of the voice acting to be quite shoddy.
"Quest for the Chaos Emeralds Part 1"/"Blackbot the Pirate": Kazuhide Tomonaga; Nakamura Productions.
"Quest for the Chaos Emeralds Part 2"/"Hedgehog of the Hound Table": Kenji Hachizaki; Anime Spot.
"Quest for the Chaos Emeralds Part 3"/"Robotnik's Pyramid Scheme": Atsuko Tanaka; Actas.
"Quest for the Chaos Emeralds Part 4"/"Prehistoric Sonic": Toshihiko Masuda; Studio Jungle Gym.
"Super Robotnik": Kenji Hachizaki (first half, left during production to work on Farewell to Nostradamus), Yuichiro Yano (second half), Hiroyuki Aoyama (the Sonic Sez segment of the episode); in-house.
Executive Meddling: Sonic Christmas Blast was originally intended to be titled An X-Tremely Sonic Christmas as a tie-in with the game Sonic X-treme, but the game's cancellation forced it to be titled for Sonic 3D Blast instead.
Dr. Robotnik was originally conceived as television's sexiest fat man. The animators weren't up to the challenge, but it didn't stop them from slipping in a lot of shirtless scenes and scenes that draw too much attention on Robotnik's rear end (and, of course, the completely unnecessary bikini pic from "Hero of the Year.")
Fake American: Jaleel White was the only American voice actor. Everyone else in the cast was based in Vancouver. Although...
Hey, It's That Sound!: The episode "Grounder the Genius" features two of the actual sound effects from the Sonic gamesnote Thefirstthree in one part of one scene; specifically, the "jump" and "ring" sound effects.
There was a workprint of a pilot episode that was screened when the cartoon was being pitched to ABC. Unfortunately, the network hated it and instead preferred DiC's second idea of a Sonic-themed television series, ultimately leading to the pilot being scrapped. The workprint itself can be seen on YouTube.