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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.
- You may be looking for other uses of anti-matter or the gell guard minions of Omega.
However, the presence of more than one Time Lord confused the organism, causing it to send more than one individual into Omega's domain. (TV: The Three Doctors)