Anti-matter organism
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- You may be looking for other uses of anti-matter or the gell guard minions of Omega.
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.
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)