Interdimensional parasite

The Interdimensional parasite was a creature that was capable of entering the Universe through the Interdimensional bridge.

Overview
The parasites were black worm-like slugs which were capable of infesting other creatures. Once inside the body, they began a mutagenic change by forming a sac inside a host body. The creature emits radiation which appears to be part of it's biology which begin's to change the host's body into a much more monstrous, fleshy form. This result's in the host becoming much more aggressive and violent as it begin's to kill anything in its path. The change was quite evident as even simple docile creatures can be turned into mindless brutes by the parasite.

History
The creatures began plaguing the galaxy when the SGC began to deploy Sodan cloaking devices for use by recon team's when scouting out Ori activity in the Milky Way galaxy. However, it was discovered that machine's induced a radiation which was harmful to Human's but not Jaffa. As such, the mechanism that produced the radiation was disabled allowing for use by SG teams.

However, it was learnt that the radiation was a vital part of the process as it worked to kill the parasites before re-entry into the normal universe. Without this radiation, the parasites began appearing on the worlds where the device was being used. They began infesting various local animals and mutated them turning them into violent beasts that attacked various people.

A parasite infested an animal on P9J-333 as well as on Earth where they began causin numerous death's until the SGC became aware of the source of the threat.