Much of Sonic Adventure centers on Sonic, a hedgehog who has the ability to run at supersonic speeds, and Miles "Tails" Prower, a two-tailed fox who often accompanies Sonic on his adventures; they are the main characters of the game who are in pursuit of Eggman. Supporting characters include Knuckles, an echidna who guards the Master Emerald on Angel Island, Amy Rose, a pink hedgehog who has a crush on Sonic, and newcomers Big the Cat and E-102 Gamma. Big is a purple, noticeably overweight cat who must rescue his best friend Froggy who became possessed by Chaos' tail, and swallows Big's "lucky charm", a Chaos Emerald, which causes him to mutate. Gamma is one among a series of robots designed by Eggman to take orders without question. After an encounter with Amy, he suffers a malfunction and gains a "conscience". He then turns his aim to destroying his robotic brothers and freeing the animals trapped inside them.
The main antagonist of the game is Eggman, who has formulated a new plan to conquer the planet, this time not relying on his robots alone, but employing a strange liquid creature known only as Chaos. Chaos also serves an antagonistic role in the game, and is the guardian of the Chao. He is apparently water or a plasma-like material and changes form after consuming a Chaos Emerald. After consuming all seven Chaos Emeralds, he turns into Perfect Chaos, which Eggman aims to use in order to conquer the planet. The main antagonist of Amy's story is E-100 Alpha (better known as Zero), the first E-100 series robot who is a large green robot and is considered the prototype.[5] Zero is one of Dr. Eggman's Robots sent to find Amy's friend Birdie. He follows Amy wherever she goes hoping to capture her and the bird. At one point he succeeds but Amy is rescued by E-102 Gamma. Eventually Zero is defeated by Amy on the Egg Carrier.

Tags: sonic, adventure, demo

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