After settling in Green Hills, Sonic is eager to prove that he has what it takes to be a true hero. His test comes when Dr. Robotnik returns with a new partner, Knuckles, in search of a mystical emerald that has the power to destroy civilizations. Sonic teams up with his own sidekick, Tails, and together they embark on a globe-trotting journey to find the emerald before it falls into the wrong hands. Teen Titans Go! is an animated series that follows the adventures of the young Titans: Beast Boy, Robin, Cyborg, Raven and Starfire. They reside in Jump City when they are not saving the world while living together as teenagers without adults who disrupt the young Titans. this will be a tv show called blue hedgehog and the titans: season 1 episode 1: blackfire vs Sonic: plot: sonic heard a news report about starfire's evil sister black fire and goes to stop her.