He dies because Mephiles wanted to unleash Solaris so he could destroy the dimension, so the only way of doing that is by making Princess Elise crying, so he killed Sonic by shooting a Chaos Spear at him (causing Elise to mourn over the dead hedgehog).
But sonic soon gets revived by using the power of the Chaos emeralds.
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The anagram of sonic the hedgehog "sonic the hedgehog."
No she became a robot and saved sonic.
Adventures of Sonic the Hedgehog Sonic The Hedgehog(SatAM) Sonic Underground Sonic the Hedgehog The Movie Sonic X
Sonic the hedgehog is, as his name suggests, a hedgehog.
it's (sonic the hedgehog) and (shadow the hedgehog) and (silver the hedgehog)