Silver Sonic

Silver Sonic (referred to as Mecha Sonic in the Japanese manual ) is the robotic version of Sonic the Hedgehog that appeared as a boss in the Death Egg Zone in Sonic the Hedgehog 2. It is apparently an early version of Metal Sonic, a better known robotic double of Sonic.

Silver Sonic resembles the original Sonic, although he is twice as tall and not coloured blue. Instead, he is a metallic grey colour. He possesses many of Sonic's moves, including the turbo-dash and spin-jump.

In order to defeat him, Sonic must strike him 8 times on the head while avoiding his spikes (not easy considering there are no rings in the zone).

A lesser known Sonic robot resembling Silver Sonic was featured in the Game Gear/Master System version of Sonic the Hedgehog 2. This game was released earlier than the Genesis version and so the robot may be a prototype of Silver Sonic. It's fought in Scrambled Egg Zone without any rings as in the 16-bit version.

Archie Comics
In the Archie Comics continuity, Silver Sonic appeared in the miniseries Sonic Quest, a loose adaptation of Sonic 2 and Sonic 3 & Knuckles. This version of Silver Sonic was much larger and slower than the version in the games, standing about ten times the size of Sonic the Hedgehog.

History
Sonic and Tails encountered Silver Sonic during their mission to destroy Robotnik's new Death Egg space station, which despite its speed proved to be a formidable opponent. Silver Sonic's exoskeleton was invulnerable to Sonic's best hits. With a single powerful punch, it nearly knocked Sonic unconscious, but in the process it exposed electrical wires from inside the Death Egg. Before Silver Sonic could crush Sonic to death beneath its foot, Sonic used the cables to send thousands of volts of electricity into Silver Sonic, destroying its primary brain circuits and rendering him inoperable.

Robotnik, having witnessed the defeat of his creation, put on his Eggs-O-Skeleton armor so he could battle Sonic himself. However, Sonic was able to climb inside Silver Sonic's head and control the robot's body manually. Silver Sonic was so strong that Sonic was able to send Robotnik flying out of the Death Egg. Shortly afterwards, Tails activated the station's self-destruct sequence, and Sonic and Tails used Silver Sonic's body to escape safely back to Mobius.

Years later, a new robot named Silver Sonic II was created, loosely based on Silver Sonic's design but much smaller.

Sonic the Comic
In Sonic the Comic, Sonic and Tails return to the Death Egg some time after the events of Sonic 2 to find that Silver Sonic is still functional (barely). It is heavily damaged, and Sonic comments that it is a sad imitation of him. (In Nigel Kitching's original script for the story, it is mentioned that the Silver Sonic actually repaired itself after Sonic's previous encounter with it.) Sonic defeats it for good by kicking off its head. It was presumably a forerunner of the Metallix robots in this continuity.

In this continuity, the robot was not referred to by name.