Adventures of Sonic the Hedgehog was a cartoon made by DiC in 1993. It was one of three of the Sonic cartoons made by them. But AoStH has a pilot episode that can be found on YT but it’s in low quality and is incomplete. Several parts of the pilot can be found in HD on commercial but the full pilot in good quality isn‘t found. The video on YT was uploaded by one of the show’s directors. SEGA might still have this in their archives.