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Quotation1 The Orbinauts return as one of Sonic's most challenging Badnicks! Pay close attention, you only have a split second to defeat them. Quotation2
Profile, Sonic the Hedgehog 4: Episode I website

The Unidasu (ウニダス Unidasu?),[2][1] is a recurring enemy in the Sonic the Hedgehog series which first appeared in Sonic the Hedgehog (1991). It is a Badnik variant and an Orbinaut model created by Dr. Eggman which fires spiked balls at enemies.


As part of the Sea Urchin-like Orbinaut series, Unidasus resemble its other variations such as Uni Uni. They have a spherical body with wide eyes and four red spiked balls orbiting their body. Usually, their body is blue when in their neutral state, but when spotting an enemy, their body turns red. They also usually have black eyes, but had cyan eyes in Sonic Lost World.

In Sonic Adventure and Sonic Adventure 2, the Unidasus' bodies were colored black with cyan eyes. They were also given a grey bottom plate and small motors on their back. Orbiting them are four black, explosive orbs with white spikes on them.

Game appearances

Sonic the Hedgehog (1991)


First appearing in Sonic the Hedgehog (1991), the Unidasus appears in Labyrinth Zone and Scrap Brain Zone Act 3. In the case of the latter, they are normally found in the underwater sections where they are cramped inside narrow passages, thus obstructing the player's path. The player's best option is to let them fire their spiked balls and then attack them from a vulnerable angle.

In the 8-bit version of the game with same name, Unidasus once again appears in Labyrinth Zone. In this version, they have a light blue body instead. That aside, they behave like their 16-bit counterparts. Like other Badniks in the game, they also do not have any Animals powering them.

Sonic Adventure

Spiky Spinner artwork

The Spiky Spinner as it appears in Sonic Adventure.

In Sonic Adventure and Sonic Adventure DX: Director's Cut, the Unidasu is an E-Series model referred to as the Spiky Spinner[8] (ウニダス[3] Unidasu?, lit. "Unidus"), or E-15 Spiky Spinner.[citation needed] In this game, they were given a slight redesign, making them look more mechanized. They appear in the following Action Stages for each character:

Character Action Stage
Sonic Speed Highway, Sky Deck
Tails Sky Deck, Speed Highway
Knuckles Speed Highway, Sky Deck

In gameplay, Spiky Spinners hover back and forth. They start attacking should the player get close enough and will use one of two attack patterns: they either throw their explosive spiked balls at the player or rotate their spiked balls over a wider radius for a sweeping attack. After losing their spiked balls, the Spiky Spinners will still follow the player, but are now wide open to attacks. When destroyed, they release a collectible Animal.

Sonic Adventure 2

Sa2 unidus

An Unidus approaching Knuckles in Sonic Adventure 2.

In Sonic Adventure 2 and Sonic Adventure 2: Battle, the Unidasu is again an E-Series model named Unidus[4] (ウニダス Unidasu?), or E-32 Unidus.[citation needed] They also show the same design they had in Sonic Adventure. The Unidus appears in the following Action Stages for each character:

Character Action Stage
Tails Hidden Base
Knuckles Death Chamber

In gameplay, Unidus use the attack pattern from Sonic Adventure where they rotate their spiked balls over a wider radius for a sweeping attack. However, they will not launch their spiked balls at the player. Defeating a Unidus rewards the player with 100 points and releases a collectible Animal inside it.

Sonic Rivals 2

In Sonic Rivals 2, the Unidus from Sonic Adventure 2 appears as a collectible card. Their card is collected by getting the high score in the boss duel for Neon Palace Zone.

Sonic the Hedgehog 4: Episode I

Orbinaut in Sonic 4 - Episode 1

The Unidasu in Sonic the Hedgehog 4: Episode I.

In Sonic the Hedgehog 4: Episode I, the Unidasus (referred to here as Spike Spinners[7]) appear in Lost Labyrinth Zone with a slightly upgraded design. Despite that, they have the same attack patterns as in previous games. However, Unidasus' bodies are in this game constantly red instead of changing when spotting Sonic.

Sonic Lost World


A mad Unidasu in the Wii U version of Sonic Lost World.

In Sonic Lost World, the Unidasu appears in both the Wii U and Nintendo 3DS version of the game. During the game, it turns out that the Badniks (the Unidasus included) got hijacked by the Deadly Six.

In the Wii U version of the game, Unidasus can be found in Frozen Factory Zone 4 and Sky Road Zones 1, 4 and ?. They also retain their coloration change from blue to red when spotting the player. In the 2.5D side scrolling sections, Unidasus hover around while their spiked balls orbit them laterally. They are here often stacked with Uni Unis to create huge enemy walls. In the 3D sections of the game, their spikes orbit them horizontally instead. When noticing Sonic, their spiked balls freeze in their position and are launched laterally at the player one by one rather fast.

In the Nintendo 3DS version of the game, Unidasus appears only in the 3D sections in Sky Road Zone 2. Unlike the Wii U version, Unidasus never fire their spiked balls or turn red when spotting the player, and instead however around with their spiked balls (much like the Uni Unis). The player has to avoid hitting their spike balls by targeting their body from above.

Powers and abilities

Unidasus floats around paths with spiked balls orbiting their body. Once they spot the player though, the Unidasus' body turn from blue to red, and they start firing their spiked balls straight towards the player one by one (albeit slowly), usually in orbital order from the bottom of their body. Their spiked balls usually orbit them laterally, but in 3D installments such as Sonic Adventure and Sonic Lost World, they occasionally orbit them horizontally.

In most of the games, Unidasu's spiked balls are thick obstacles, while in Sonic Adventure, spiked balls are explosive after they come in contact with its victim.

In other media

Archie Comics

The way how fan comunnity reacts to Sonic the Hedgehog 4

A group of Orbinauts as they appear in Archie Comics.

In the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics, the Unidasus' name is never mentioned and are instead referred to as Orbinaut. They were among the first generation of badniks produced by Dr. Robotnik. Over time though, the Orbinauts were rendered obsolete by more advanced robots and got decommissioned.

Following the events of Worlds Collide, the Orbinauts' history became nearly identical to that of their game counterparts.



Concept artwork




See also


  1. 1.0 1.1 One of artworks showcasing Uni Uni and Unidasu from the Sonic World feature of Sonic Jam.
  2. 2.0 2.1 Sonic the Hedgehog (1991) (Sega Genesis) Japanese instruction manual pg. 44.
  3. 3.0 3.1 Sonic Adventure (Dreamcast) Japanese instruction manual pg. 34.
  4. 4.0 4.1 "Eggman's Robot Series". Sonic Adventure 2: Prima's Official Strategy Guide. Prima Games. 20 June 2001. p. 18. ISBN 978-0761536147. "Be careful when you're close to Unidus. Smaller spike balls circle a larger spike ball and will hurt you (surprise) if you touch them. You can't hurt the circling spike balls, so attack the central one as it move around on the ground. Hit its center, and the Unidus is history."
  5. Pattenden, Mike (4 January 1993). "Robotnik's Badniks". Stay Sonic. Fantail. p. 36. ISBN 978-0140903904. "Orbinauts are extraordinary creatures. Part animal, part machine, all nasty, they can be found underwater in the Labyrinth Zone, on dry land in the Star Light Zone and in the Hilltop Zone in Sonic II. They come in all colours, some of them throw four spiky missiles, some have missiles but don't throw them, and some don't even have missiles (Sonic's careful of those ones because they can't be killed) but they all have a middle bit with big eyes, and they are all slow-moving. If Sonic sees an Orbinaut, back away from it. Jump over the missiles, then attack. If they don't throw their missiles, Sonic jumps over them."
  6. "Additional Characters". Sonic the Hedgehog - Classic Style Guide. p. 29.
  7. 7.0 7.1 "A new series of Sea Urchin type robots which were developed based on the "Orbinauts" & "Spike Spinners" featured in Episode I. The blasting flames of the burners are certainly dangerous, but those fires will spread widely in oily places. Take extra care." — Flamer's profile from Sonic The Hedgehog 4: Episode II website.
  8. 8.0 8.1 Sonic Adventure (Dreamcast) North American instruction manual pg. 31.

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