If a game succeds it usually got a TV show, which it isn't as good as the game because it is totally different to the game this series.
Sonic got 4 shows, from which I read, only 2 succeded.
First it come Adventure of Sonic the Hedgehogs. It was childish, but it was also hilariious at times and remember it was headed for young kids. Not necessary to a 20 year old fan. As far as I know, it is the only series it got a message for kids called "Sonic says" (or sez by how Tails write it), some were good for kids but other made non sense ("never enter a washing machine because you will roll over it and break your head, it is also hot inside", it is this really useful?)
Then Sonic Satam come out, the best TV show from Sonic in my opinion (and from many others too).I'm being honest, I'm just starting watching it, but it is pretty interesting. The plot wasn't bad and it is nice to watch a good show based on a videogame.And I got to say, I love the voice acting for Robotnik.Unfortunately, this show was cancelled after the 2nd season, they already got the plot for season 3, but ABC wanted more space for new shows. They were even going to introdue Knuckles at ends of season 3, but it didn't live long enough.
After Satam, Underground come out. I never watched this one but I read Sonic got a family (when did this happen?) and they used musical instruments as weapons. That sound very weird. And for the only time, Tails isn't on the show.
And then come out Sonic X. I don't think I need to talk about this one, except it was the long lived series, even when it was the worse.
If SEGA wanted to do a Sonic show on the new century, why they didn't continue Satam? or why did they added Chris? I guess I would never know the answer.