Orbinaut (ポーラ Pōra?, lit. "Pola") is an enemy that appears in Sonic the Hedgehog 3. It is a mass-produced Badnik model created by Dr. Robotnik and a variant of the Badnik sub-series with same name.
As a part of the Orbinaut series, this Orbinaut variant has a gray metallic sphere for a body with a pair of eyes on it and four spiked balls orbiting it.
The player only encounters the Orbinauts in Launch Base Zone. In gameplay, their attack patterns are identical to the Uni Uni's in Sonic the Hedgehog (16-bit), keeping their spiked balls around them for defense and moving towards the playable characters once they get close. Should the player move around them, the Orbinauts will still try to follow them, albeit at slower pace.
Orbinauts are tricky to defeat, as the player can only defeat them without getting harmed by having Invincibility, doing precise hit between its spiked balls with Spin Jump, performing a well-timed Insta-Shield as Sonic, or during the brief time of invulnerability the player gets after taking damage.