Nebula

Nebula is a Badnik that appears in Sonic the Hedgehog 2 for the Sega Mega Drive. It appears in the Sky Chase Zone. It looks like a small creature hiding inside an egg-shaped shell of metal with a hole beneath it. It flies using a propeller on top of its shell, and it seems to be clutching a pair of control levers. Nebula also appear in Sky Chase Zone in Sonic Pocket Adventure.

Attack Pattern
Nebula hovers in place waiting for the player to approach. When Tornado comes close to it, the Nebula flies upwards a little and drops mines from a shoot on its underside. Aside from this, Nebulas are relatively harmless, although they frequently appear in groups.

Sonic the Comic
Nebula also appeared in the British publication Sonic the Comic. They were standard flying units in Doctor Robotnik's badnik army.

Trivia

 * In Sonic Triple Trouble, a robot named Bombaberry is similar to Nebula.