Death Egg Robot

The Death Egg Robot, also known as the Giant Mech, other times known as Mecha Robotnik, is the final boss of Sonic the Hedgehog 2. It appears as the second boss of the Death Egg Zone in that game, and is fought immediately after Silver Sonic. It looks much like a giant robotic Dr. Eggman, but is in fact a suit piloted by the doctor himself. It is very difficult to defeat as there are no rings in the entire stage.

Sonic the Hedgehog 2
After beating Silver Sonic, the real hedgehog (or fox, depending on who the player chooses) chases after Robotnik, who escapes into his Death Egg Robot. It moves very slowly and the player must jump and hit the body to damage it, which is harder than it sounds, because if timed wrong, the player might touch one of the hands and die. After a while, the robot will fly off screen and a lock-on target will appear and follow the player. Soon, the lock-on will start flashing and the Death Egg Robot will slam down. If the player manages to get behind it, Eggman will launch a pair of spherical mines from the top of the mech's jetpack, almost certainly killing them. When it comes down, its hands will fire, attempting to hit the player. Repeating the process, the mech will break down and explosions will follow the player as Sonic (or Tails) will throw themselves out of the Death Egg into space.

Ending
If the player gets all the Chaos Emeralds and finishes as Sonic, a storybook-like ending will play with Tails and the small animals watching the Death Egg explode. Tails then gets into the Tornado so he can start adventuring, while flying, he spots Sonic, who activated his super form sometime after escaping the Death Egg. The two then fly away and fly toward the screen. If the player fails to get the Emeralds, the ending is the same, but Sonic will land on the wings of the Tornado and will jump toward the screen.

Sonic the Hedgehog 4: Episode I
The E.G.G. Station Robot also appears in Sonic the Hedgehog 4: Episode I. It is the upgrade of the Death Egg Robot and features a new color scheme is. It is, in essence, the same mech from Sonic 2, but like the other bosses it shows new attack patterns after being heavily damaged. After sixteen hits, it becomes surrounded by electricity, making it impossible to damage. It also appears to malfunction, randomly leaping across the field both forward and backward, firing its rocket hands at a much faster pace. To damage it, Sonic must knock its severed arms back into it when one flies off and floats back down. This disables its electrical field long enough to strike its body. After about six hits, the mech starts shooting lasers at Sonic from a compartment in its head. There are two types of lasers, the first being pink bullets commonly used by many other enemies within the levels and second a powerful beam reminiscent to lasers used in Sonic Advance.

On its last hit, the machine will fly up and attempt to destroy the space station around it to drop Sonic into the vaccuum of space. It must be hit before the floor falls apart to clear the game. If the player doesn't hit the robot in time the Mech will break the floor causing you to fall and lose a life. This move is similar to the Egg Viper's last attempt to defeat Sonic.

Sonic Generations
For more, see: Death Egg (Sonic Generations)

In Sonic Generations, the Death Egg Robot appears as the main boss of the Classic Era. Classic Sonic fights it aboard the Death Egg, after Sky Sanctuary, representing Sonic the Hedgehog 2.

Additionally, this version is much taller than its Genesis counterpart, and features a sturdier chassis that cannot be damaged by Classic Sonic's normal attacks (apart from several weak spots located in its posterior and head). Wheels also appear to be installed in its feet, giving it a higher level of maneuverability. The antennae seen on the head of the original model are also absent and the arms appear to have been redesigned to launch telescopically. The arms are also much bulkier to allow for the rotary spikes on their ends.

Later in the game, this boss makes a cameo in Speed Highway (Sonic Generations) and City Escape. It shows up on a poster for Chao in Space: The Search for Tikal.

Adventures of Sonic the Hedgehog
The Death Egg Robot appears in the episode "Momma Robotnik's Birthday. It appears where Momma Robotnik shows a video to Tails about Robotnik where you see he is on it then he fell down when the robot moves, although the Death Egg Robot is actually a robot instead of Eggman in it.

Sonic OVA
Robotnik has a machine called Metal Robotnik which is largely based on the Death Egg Robot.

Sonic the Comic
The Death Egg Robot (referred to only as Robotnik's "deadly battle armour") appeared in flashback in Sonic the Comic #27, "Part 2: A Tale of Tails". The main events of Sonic the Comic take place after Sonic 2, and in the story in question, the Death Egg Robot is revealed to have played precisely the same role as in the game: Sonic fought Robotnik aboard the Death Egg (with Robotnik in the Death Egg robot) in order to prevent the satellite's operation.

Archie Comics
Although the Death Egg Robot itself would later appear, Doctor Robotnik did wear a powered suit of body armor called the Eggs-O-Skeleton in Sonic Quest #3, "Over Easy", as part of Archie's original adaptation of the Death Egg saga.

The real robot appeared in the Genesis Arc of Issue #229, as Eggman's last defense against Sonic aboard the Death Egg Mark II in a battle very much like the one in Sonic 2. It was destroyed by Super Sonic, who managed to tap into the station's power matrix to remotely access the Chaos Emeralds fueling it.