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This giant combat machine has a total height of 130 feet. Laser beams can be fired from both its head and the joints of its tail. The shields that cover both the top and sides of the cockpit have a mechanism that enables them to be moved and used in combat.

— Description, Sonic Adventure website[1]

The Egg Viper (エッグバイパー Eggu Baipā?), also known as just the Viper,[2] is a vehicle that appears in the Sonic the Hedgehog series. It is a giant, viper-based combat machine created by Dr. Eggman which was used by the doctor to battle Sonic during the Chaos incident.



In keeping with its name, the Egg Viper is designed after a large flying viper. It has two large red and gray spiked wheels on both side of the cockpit which the Eggmobile can fit inside. The cockpit itself is covered in thick red and gray armor and has two fins on the bottom, yellow and black hazard stribes horizontally along the middle, a single fin on top with a red and gray tube on each side, and a large gray laser cannon down the front which can slide back to reveal the pilot. On the cockpit's rear are three large red and gray flap-like shields. Beneath these shields are a long red and gray segmented tail which has spikes and green spots running down it.

Features and abilities

The Egg Viper's head and joints on its tail are equipped with a multitude of laser cannons which can fire intense laser beams, the most powerful which can cause small explosions. The shields that cover both the top and sides of the cockpit also have a mechanism that enables them to be moved and used in combat.[1] When moved into position, these shield can charge up concentrated bursts of energy and launch them at opponents (although such a maneuver leaves the Egg Viper without defenses). The Egg Viper can also detach its spiked wheels and thrust them through midair like spinning sawblades, which will then return to the Egg Viper like boomerangs.

Weapons aside, the Egg Viper is capable of flight through midair. It is also quite powerful and durable, being able to plow through several metal platforms without slowing down or taking damage.


  • Height: 130 ft.[1]
  • Length: 40 m.[3]


Sonic Adventure

In Sonic Adventure, after braving the Final Egg, Sonic made it to the center of the base where Dr. Eggman was waiting in the Egg Viper for their showdown. As the Egg Viper flew away, Sonic followed it to the battle arena inside the Final Egg's main tower using a rocket. There, Sonic and Eggman engaged in an intense battle which ended when Sonic dealt the Egg Viper a critical blow that caused it to start blowing up. In a last-ditch attempt to claim victory however, Eggman tried steering the failing Egg Viper into Sonic, but failed. After the Egg Viper exploded, Sonic and Eggman escaped the Final Egg.

Other game appearances

Sonic Rivals

In Sonic Rivals, the Egg Viper appears on the 126th collectible card in the game.


The Egg Viper is the seventh and final boss of Sonic's storyline in Sonic Adventure, its enhanced port Sonic Adventure DX: Director's Cut, and the 2010 remaster. In Adventure Mode, it is fought after clearing Final Egg for the first time as Sonic. In Trial mode, it is the fifth and final boss in the Boss Sub Game as Sonic.

The Egg Viper is fought as Sonic by default. In Sonic Adventure DX: Director's Cut and the 2010 remaster though, it can also be battled as Metal Sonic in the Boss Sub Game.

Boss guide

The boss battle against the Egg Viper takes place across two platforms above a bottomless pit in front of the Egg Viper. Each side of the platforms have a small set of Rings to be collected. Over the course of the battle, the Egg Viper uses different types of attacks according to its life gauge:

  1. The first attack pattern is firing four or five laser beams from its tail in a row. To avoid this attack, Sonic must keep moving in different directions to avoid being hit. Eggman then simply reveals himself, allowing the player land the Spin Jump on him.
  2. The Egg Viper starts to charge and shoot an energy ball as its second attack. During the charging process, the cockpit exposes itself on the machine, giving Sonic a chance for attacking him. To damage him, Sonic can Homing Attack into the nodes on the Egg Viper's tail which leads up to the cockpit.
  3. The third attack pattern is shooting a powerful laser with the machine's laser cannon. First, the Egg Viper takes an aim at Sonic before firing. After a short time of moving, the cannon is fired and a quick reaction helps Sonic avoid it.
  4. When the life gauge reaches half, the Egg Viper flies over the platform where Sonic is standing and shoots laser beams at Sonic's position as Eggman's gloats at him.
  5. The common attack pattern during the last half of the machine's life gauge is launching its razor discs. This can be used to damage the Egg Mobile too. To avoid this, Sonic must get as far away as he can or just jump when the disc comes close. Once the disc stops, he can jump on it to reach the Egg Viper's top and attack it with the Homing Attack or the Light Speed Attack.
  6. After destroying the platforms on the other side, the Egg Viper destroys a platform where Sonic is standing and shoots its razor discs again. This pattern is used until the life gauge reaches zero. If Sonic keeps missing his chances to hit Eggman in this phase, he eventually runs out of platforms and falls to his death.

After Sonic has completely depleted the Egg Viper's life gauge, the machine will convulse uncontrollably and will attempt a suicidal attack, in which the Egg Viper will ram into the platform Sonic is standing on. A quick Spin Dash or Homing Attack is required. If it succeeds, it kills Sonic alongside the machine and they both fall in the bottomless pit; this can be problematic if Eggman has destroyed many platforms during his attack due to Sonic missing his chances to attack Eggman. If only one platform remains by the time Eggman attempts the suicide assault, Sonic's doom is certain. But once safely evaded, Sonic's story will be cleared.


Name Artist(s) Length Music track
"Militant Missionary ...Boss: Egg Walker & Egg Viper" Masaru Setsumaru, Kenichi Tokoi 1:17


In other media

Books and comics

Archie Comics

In the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics, the Egg Viper was one of the elements introduced after the second Genesis Wave rewrote reality.

When the Super Genesis Wave re-wrote history, the Egg Viper became largely identical to its video game counterpart.

IDW Publishing

Main article: Egg Viper (IDW)

The Egg Viper, from Sonic the Hedgehog #1.

In the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing, the Egg Viper is one of the many Eggman mechs that Sonic has fought over the years. Its past is virtually identical to its game counterpart's, up until after the events of Sonic Forces. Inside an Eggman testing facility in partuclar, there were four remote-controlled Egg Vipers in different colors and with different powers: electricity, fire, water and wind. These models were used to attack Sonic, Tails and Amy, but they were eventually destroyed when Tangle came to help.


Sonic X

Main article: Egg Viper (Sonic X)

The Egg Viper, from "Revenge of the Robot".

In Sonic X, the Egg Viper was a mecha created by Dr. Eggman as his secret weapon against Sonic after many of his previous plans were ruined by him. He eventually used it to fight Sonic in his Final Egg. After it was destroyed however, the Final Egg itself was also destroyed.


Textures from the Egg Viper with the code name "EG3".

  • Like the Egg Hornet and the Egg Walker, the Egg Viper has the code name "EG3". It is displayed around the vehicle's gray and orange metallic parts.
  • The Egg Viper is similar to the Egg Wyvern. Both bosses are the same color, both are suspended above low ground, both battles have a part where the player attack Dr. Eggman head on, and both bosses destroy platforms and decrease the amount of space they have to run on.
  • Both the Egg Viper and the Egg Walker, have become infamous for Eggman's line "Get a load of this!", which he repeats many times during their respecitve battles.
  • With a total of seven hits required to defeat it, the Egg Viper has the most health out of every boss in Sonic Adventure, even having more health than Perfect Chaos.


  1. 1.0 1.1 1.2 Sonic Adventure Online. Sonic tactical info: Egg Viper Endurance: 7. Archived from the original on 31 May 2016.
  2. Stratton, Bryan (17 June 2003). "Sonic's Boss Battles". Sonic Adventure DX: Director's Cut: Prima's Official Strategy Guide. Prima Games. p. 11. ISBN 978-0761542865.
  3. (in Japanese) ソニックアドベンチャー オペレーションガイド. SoftBank. January 1999. p. 70. ISBN 978-4757203006.

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