Here's something very interresting I found out not too long ago. While Jim played Dr. Robotnik in the famous Sonic SatAM series, he was actually going to play Robotnik (as well as a few additional robots) in the original concept for the Adventures of Sonic the Hedgehog...
here's the footage
I'm guessing this was before ABC wanted a different direction... that series featured US voice performers (Rob Paulsen, Kath Sourcie, and Charles Adler were in the show)... I'm guessing had they made this Sonic series the ABC Saturday series, they wouldn't have used a Canadian cast.
But I gotta tell ya... as much as I love Jim Cummings, I think Long John Baldry's AOSTH Robotnik was far more memorable, and he had a LOT more fun in that role. Honestly, I just can't picture Jim saying "Snooping as usual, I See!" as wacky as John did it. At least with the voice Jim used... I'd say that some sort of snotty, upperclass version of Pete would have worked.