Michelle 'Michey' Leyland I first watched the series when I was ten years old and loved it. I hadn't watched the older sonic cartoons so I didn't mind the big changes they made for this show. Manic was my favorite character, he's really cool and funny. The bounty hunters Sleet and Dingo are also great for the failing villains. I liked the story lines to it and the episodes were fun and entertaining. I adored the real 'freedom fighter' theme it has and the action parts.The only things wrong with this show are that it was never given an ending, due to the show being cancelled, and people over the age of ten will hate the songs.Overall, I think it's a good cartoon that you can watch over and over. However, if you're a big sonic fan, you probably won't like it because it's different to what you're used to and it doesn't have some of the characters from the old ones.

Cartoon King "Sonic Underground" is the last Sonic cartoon to be produced by DIC Entertainment. And it was definitely the most farthest away from the Sonic games of any of the Sonic shows. What I mean by that is. "Adventures of Sonic the Hedgehog" was somewhat close to the games. It had a similar story, but everything was surreal and very Felix the Cat like. The second one "Sonic the Hedgehog" or "Sonic SatAM" was close to the games, but it made the story bigger, more complex, more interesting and it most likely took place after the games due to Robotnik being ruler of Mobius. The next one was a direct-to-video movie that was very close to the games, except the fact that it got some names wrong, like Planet Mobius being instead called Planet Freedom. But "Sonic Underground" has barely anything to do with the original Sonic story-line. For some reason now Sonic is a prince and has a brother and sister. Which is very weird if you ask me. Also the only familiar characters in the show are Sonic, Robotnik, Uncle Chuck, and Knuckles. Tails is gone, Sally's gone, Snively's gone, Antoine's gone, Bunnie's gone, Rotor's gone, Dulcy's gone, King Acorn's gone, Naugus's gone. And this version of Robotnik is really quite boring. The Robotnik in the Sonic games was an evil, goofy-looking, scientist bent on ruling Mobius. In Sonic SatAM and the Sonic comics he was the same, only more sinister, creepy-looking, menacing, and evil. In this one he has a very bad voice actor who doesn't even come close to the wonderful job Jim Cummings did in Sonic SatAM, and also his personality here is just boring. Sonic's brother and sister are BOTH voiced by Jaleel White, and he is good as Sonic and Manic, but he sounds WAY too much like Steve Urkel for Sonia. There are plenty of voice actresses out there that could've done better than Jaleel White did as Sonia. There's Kath Soucie, Nancy Cartwright, Tress MacNeile, E.G. Daily, Candi Milo, Carolyn Lawrence, Christine Cavanaugh, and many more. I just don't understand why he had to play her too. And plus she is very annoying. She cares only only about her hair, her clothes, and her looks, and that all makes her a very annoying character. Also the story of them being separated from their mother is just..... not Sonic. And I still hate the idea of Sonic being a prince. However despite my complaints there are a few good things about the show: While the lyrics were stupid, the songs they sang were actually kinda catchy.The animation was very well-done. It looks better than it did in the previous Sonc cartoons.I liked Robotnik's henchman Sleet and Dingo. They weren't as good as Snively, but they were a lot better than Scratch and Grounder.Some episodes were really good. I really enjoyed "Getting to Know You"; "Wedding Bell Blues"; "To Catch a Queen"; and "A Hedgehog's Home is Her Castle".Overall this show isn't that good, but it does have some good points. I think instead of this they should've done a sequel to Sonic SatAM, which was in fact Ben Hurst's original plan for this show. Still this show was overall a disappointment, and was actually kind of an annoying show.Rating: 4/10 "Mediocre"

EarthwormZim I've only seen a few episodes of this series, but I can tell you that this show is not that good.Characters Well, we've got Sonic in there and Eggman (or Robotnik, whatever) Knuckles also appears along with Athair and Uncle Chuck, (Archie Comics) and of course there's Sonic's triplet brother and sister (?) and of course we all remember Sleet and Dingo (?)What? What about Tails or Amy? Apparently, DIC thought that having the recognisable characters whom we have come to know and love was a bad idea so make way for these forgettable idiots.Manic, the cactus-green kleptomaniac hedgehog and Sonia, the pink pansy princess hedgehog.StoryQueen Aleena, Sonic's mother whom we have never heard of, is warned by some freaky reptilian-anteater (I forget to mention that they had aliens in this show as well) that Robotnik will somehow take over the planet of Mobius without actually doing anything. Since Aleena apparently thought ahead and gave her three young children magic pendants that turn into weapons and musical instruments, she sends hem to adoptive families to wait until the time is right. How she knows when the time is right, I don't know, but she just does.After all three bushpig's families are pwn3d by robots, they meet up and become an underground rock band for some reason. (and yet they play no rock songs) and travel Morbid Mobius to find their mother, even tough she tends to directly intervene with their battles.Wait, if she knows their exact location, why doesn't she just meet them there and end this awful series? AnimationNO! I keep hearing people going on and on about how well this series was animated and how great the character designs are, even the people who DON'T like it. Get it through your heads, this series is badly animated. Here's an example. In one scene, while The Sonic Unrground (Yes, it's meant to be said with a The) is in a sewer, some robots come and we see their commander, Sleet the Wolf, pointing at the hedgehogs while standing perfectly still. His mouth is also open even tough he isn't saying anything so it looks he has lockjaw. And Sonic and Manic just look fat. Nothing looks like it should be in Sonic the Hedgehog.VoicesYeaaaah....not that great. Jaleel White voices Sonic again like the other series, but he also voices Manic and Sonia. Manic is given a surfer-dude accent, but he speaks to damned fast! Most of the time he sound like he forgets to add punctuation to his words. Sonia's meant to be a girl, so why is she being voiced by a man?They also have this annoying rule in which they must cram one song into every single episode. I have nothing against musicals, but it just doesn't work as a TV series. If it was a short series, like 6 episodes maybe, but not 40. The special effects they have in these music videos are awful. You could get most of these effects on an 80s computer game! Also, the singing voices sound nothing like the real voices. In short, I like muffins.

Planty_Pie I've seen a lot of episodes from this series and I love them!OK it may not have all the main characters that we love from SATam but it has new people.OK Sonia's voice is annoying but you get use to it and Manic's pretty cool as well and it has a darkish storyline with the whole mum having to give up her babies in order for them to defeat Robotnik and Robotnik doesn't seem all happy clappy annoying unable to do anything right OK he can't do much right but he seems pretty evil and not drawn to look stupid,like SATam,kinda scary and menacing. The Songs are pretty addictive after a while some may be annoying like Where's there's a will etc but the rest aren't that bad. All in All I love this series way way better then Sonic X but not as much as SATam