From Sonic Retro

Srzg scrhd.png
First seen: Sonic Riders: Zero Gravity (2008)
Species: Eggman robot (MeteorTech)
Gender: N/A, referred to as male

SCR-HD is a playable character and the primary antagonist for Sonic Riders: Zero Gravity on the Wii and the PlayStation 2. An Eggman robot produced by Meteor Tech, SCR-HD goes insane after coming into contact with the Arks of the Cosmos, eventually transforming into the twisted Master Core: ABIS aboard Astral Babylon. The robot is destroyed by Sonic the Hedgehog during the game's final level, Mobius Strip.

The robot races without using Extreme Gear, instead curling up into a wheel configuration and blazing forwards under its own power. In cutscenes it is shown with the ability to fly.


In Zero Gravity, Dr. Eggman has established the Meteor Tech robotics corporation as a front for his activities in the high-technology region of Monopole. Described as "the leading security company" in the game's opening sequence, Meteor Tech produces SCR-HD and SCR-GP model 'bots in its MeteorTech Sparkworks, and controls them from Crimson Tower via the Mother Computer. It seems to have been Eggman's plan to sell his (apparently harmless) robots to various other organizations around Monopole, saturating the economy with Meteor Tech models, and then later seize control of the region in one fell swoop by setting the machines to rampage.

Eggman's plan is derailed before the game begins, not by Sonic, but by beings long dead. Somewhat unwisely, Eggman used an ill-understood piece of ancient Babylonian technology - discovered in Crimson Crater - as the core of his Mother Computer. When an Ark of the Cosmos crashes as a meteorite outside Crimson Tower, the SCR robots go berserk, compelled by the malfunctioning mainframe to gather all 5 Arks and bring them to Babylon Garden.

SCR-HD seems to take the lead over hordes of SCR-GP robots in this search, being the tenacious model who pursues Amy and Storm in Aquatic Capital, and finally captures the Arks after Security Corridor at the end of the Babylon story. The reaction between the Arks and Babylon Garden unleashes the "Lightless Black", destroying the Garden and transforming SCR-HD into a giant grotesquely of a final boss, Master Core: ABIS.


SCR-HD in-game, on the starting line of Crimson Crater.

Unlocking: While SCR-GP becomes playable in Free Race as soon as the Babylon Story has been completed, SCR-HD requires luck to unlock. When playing a standard Free Race (on any track), SCR-HD will appear as an opponent on the starting line-up at random intervals. He can be most easily distinguished from SCR-GP by his character icon, which is colored gold rather than silver. Play through the Free Race as normal, and if you beat SCR-HD he becomes a playable character.

Character Type Dash Limit Power Curve
SCR-HD Flight **** *** ***** ***


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  • "SCR-HD" may or may not refer to a unique robot as opposed to a whole model line; the game is never absolutely clear on this point.
  • The SCR models' white-painted, humanoid appearance seems to derive from the Egg Gunner design from Sonic '06.
  • It can often be difficult to distinguish between SCR-GP and SCR-HD. During gameplay, HD's icon is gold while GP's is silver, and GP's character model is tinted brown. Their "eyes" are also different; GP's are rectangular with a red light while HD's form a blue chevron.

Characters in the Sonic the Hedgehog game series
Recurring characters
Heroes Sonic (Super, Hyper, Darkspine, the Werehog, Excalibur) | Tails (Super) | Knuckles (Super, Hyper) | Amy (Super, Hyper) | Mighty (Super) | Ray (Super) | Espio | Charmy | Vector | Cream | Big | Blaze (Burning) | Silver (Super) | Sticks
Anti-heroes/Neutrals Shadow (Super) | Rouge | E-102 Gamma | E-123 Omega | Jet | Wave | Storm
Villains Dr. Eggman | Metal Sonic (Rocket, Neo, 3.0) | Fang | Chaos (Perfect) | E-Series | ZERO | Eggman Nega | Orbot | Cubot | Deadly Six (Zavok, Zazz, Zomom, Master Zik, Zeena, Zor)
Teams Sonic/Heroes | Rose | Dark | Chaotix | Babylon
Other Animals (Flicky) | Froggy | Chao (Hero, Dark) | Tikal | Pachacamac | Omochao | Chaclon | Gerald & Maria Robotnik | President | King Boom Boo | Cheese | Chocola | Vanilla | G.U.N. Commander | Wisps | Mother Wisp
One-off characters
Heroes Emerl | Marine | Lumina Flowlight | Chip | Shahra | Knights of the Round Table | Caliburn | Yacker | Avatar | Barry | Trip (Super)
Anti-heroes/Neutrals Bean | Bark | Shade | Merlina | Sage
Villains Witchcart | Hocke-Wulf | Bearenger | Carrotia | Battle Kukku Army (15th, 16th, Dr. Fukurokov) | Tails Doll | Metal Knuckles | E-101 Beta | Void | Biolizard | Gemerl | Black Doom | Shugo-hei | Iblis | Mephiles | Solaris | Erazor Djinn | Captain Whisker | Johnny | Master Core: ABIS | Ix (Super) | Dark Gaia | King Arthur | Hard Boiled Heavies | Infinite | The End
Other Illumina | Secretary | Elise | Duke of Soleanna | Coconut Crew | Vikings | Professor Pickle | Wentos | Don Fachio | Dodon Pa | Koco | Ancients | Conductor | Conductor's wife | Ariem | Heavy | Bomb | Tiara Boobowski | Honey

Sonic Riders: Zero Gravity
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Original Soundtrack "Zero Gravity Tracks"