Cell

The Cell is a recurring enemy in the Sonic the Hedgehog series. It is a miniature robot model developed by Professor Gerald Robotnik which is created when an Artificial Chaos P-100s, an experimental cyborg model based on the ancient deity Chaos which roam the Space Colony ARK, divides its body mass into smaller fragments.

Appearance
The Cells have the same configuration as their parent, resembling blob-like orbs of water with a small mechanical helmet. Cells in Sonic Adventure 2 and Sonic Adventure 2: Battle have a green light on their helmet, while Cells in Shadow the Hedgehog have red lights.

Sonic Adventure 2
The Cells made their first appearance in Sonic Adventure 2 and its remake Sonic Adventure 2: Battle. Being created from Artificial Chaos P-100s, they never appear without an Artificial Chaos to spawn them.

When an Artificial Chaos P-100 spots the player in gameplay, its watery body will split into a certain number of Cells, leaving its mechanical head hovering in the air. The Cells will then attack by constantly edging toward the player along the ground and explode on contact, often in large numbers. If the player attacks them, they will explode (causing the Cells around them to explode too) but they do not hurt the player.

While the player can destroy each Cell manually, destroying their Artificial Chaos P-100's head will destroy them all at once. Each individual Cell gives ten points when destroyed, but no points are awarded per Cell if they are destroyed by the head being destroyed.

Shadow the Hedgehog
In Shadow the Hedgehog, Cells again appeared exclusively alongside Artificial Chaos P-100s, never once appearing by themselves.

In this game, Cells will emerge from the body of an Artificial Chaos P-100 when it is attacked, leaving its mechanical head hovering in the air. After floating around the head for a few seconds, the Cell will remerge with the head. Like in Sonic Adventure 2, destroying the Artificial Chaos P-100's head destroys all its Cells too, although the player can still destroy each Cell one by one. While destroying a Cell does not award points, the Artificial Chaos P-100's body will turn out smaller when its remaining Cells remerge.

Powers and abilities
Capable of acting independently, the Cells are capable of levitation and can detonate themselves to damage foes. Being formed from an Artificial Chaos P-100's body mass, the Cells can remerge with themselves to reform their gestalt form's body.