Energy-based entities
Beings of unknown size and intent which are believed to exist entirely in an energy or electronic state. A sampling of radio waves, no matter how small, causes cataclysmic damage to their technology, essentially killing them off.
Among other unknowns, the entities exist as one with their defenses. If an energy beam is transmitted for the express purpose of annihilating an enemy, the consciousness of the entity driving that force travels with it, almost like a suicide bomber. The species can transmit themselves both ways through an activeStargate, and in a matter of moments, inflict damage to conventionalEarth equipment.
The entities are self-aware and protective of their species, even to the degree of self-sacrifice. They are able to download themselves into Earth devices, such as theS.G.C. mainframe, as well as portable devices as small asM.A.L.P.s -- and even the human brain, which one entity did when it took overSamantha Carter.
DETAILS
HOMEWORLD -
FIRST APPEARED -Entity
KEY EPISODE
Entity - Stargate Command inadvertantly causes great damage to the energy-based entities when they send a M.A.L.P. probe, prompting an attack of retaliation.