Orbinaut (also known as Unidus in some Sonic games) is one of Dr. Eggman's many Badnik/E-Series robots. It appears to be a floating sphere with four spiked spheres rotating around it, protecting it from harm and mauling anyone who approaches. The mace-balls can also be launched as projectiles, though this attack will leave the Orbinaut defenceless.
- Sonic the Hedgehog
- Sonic Adventure
- Sonic Adventure 2
- Sonic Rivals 2
- Sonic the Hedgehog 4: Episode I
- Sonic Lost World
Eggman has created numerous robots similar to the Orbinaut, which are listed below.