Unity

"Energy, Unity, you would describe thus"

- ''A Unity describing intself to SGC

The Unity were a crystyline life form encountered by the SGC in the first season. The species was all but destoyed by the Goa'uld and only a small handful survived the destruction.

Biology
Unlike most races in the universe the Unity are a crystalline lifeform instead of being carbon-based. They are capable of using the electrical energy stored in their body to mimic faces in order to communicate with other lifeforms, and to release the energy as a defensive weapon. Some Unity are capable of manipulating the energy to such a degree that they can become a perfect copy of another lifeform.

Unfortunately, the unique nature of the energy in their bodies means they can only live on their own world or one was little background energy. Prolonged time on a planet like Earth will lead to death for a Unity.

Appearance
In their natural form they look like blue Crystals but they can alter the crystal surface into a face to communicate with other lifeforms.