Anti-matter organism


 * See also the Gell guards, the other anti-matter minions of Omega and the Anti-matter Creature of Zeta Minor.

The Anti-Matter Organism  was an intelligent blob of energy, capable of existing in both the universes of matter and anti-matter. The organism was used by Omega to hunt down the Doctor and, acting as a bridge, take him to the anti-matter universe.

Unfortunately, the presence of more than one Time Lord confused the organism, causing it to send more than one individual into Omega's domain. (DW: The Three Doctors)