This is Seismic the Hedgehog, he used to work for Dr. Eggman as an apprentice of him. But, that all backfired when Seismic walked into his lab one day and noticed that he was placing innocent animals in the badniks and some of the robots had some kind of emerald in them. Seismic didn't know of this, because Eggman would always tell his apprentice do other work so he could keep him busy. Well that all changed when he managed to finish much more quicker than Eggman had hoped. So when Seismic was going to check on him, he saw that the robots that he created had some weird looking emeralds being placed in them, along with the animals. But, he got too close for comfort and got himself caught by him when he locked him up in a cage later on when he gotten ahold of him. Soon after, he pulls him out of his cage and takes Seismic to a lab. As soon as he is being tied down, he glances at a syringe that has the label (Element Earth Project).

More info at my Deviantart account.