Nazo Unleashed is a fan-made Web Animation trilogy of Sonic the Hedgehog by Flash animator Chakra-X (Newgrounds, deviantART, YouTube). It is based around an unused screenshot from Sonic X that had a mysterious hedgehog with spiked-up quills and a silver coat. The mysterious character was Fan Nicknamed "Nazo", a Japanese word for "mystery". The biggest claim to fame of this series are the masterfully animated fight scenes. Of course, it's quite obvious where they got their inspiration, but it pulls it off very well, as they carry the tension, action, and fluidity as expected of those scenes.