My dear Sonic, if I had known you were coming I'd have poisoned a cake!
There's a special reason why there's three sonic cartoons. Long John Baldry, the voice of Dr. Robotnik on the very hilarious Adventures Of Sonic cartoon, has died. All three of these cartoons contain clips from the show that were put together to make a (somewhat) coherent cartoon. The third one contains clips from the "serious" cartoon, but also more clips of Baldry's very funny Robotnik voice.
The cartoon that started this mess!