Tetryon plasma is a variety of warp plasma.
In 2372 in an alternate timeline, Lieutenant Lasca asked Harry Kim to explain a dilithium fracture problem related to the tetryon plasma in the USS Yellowstone's warp nacelles, but Kim didn't know the answer and feigned sickness to get away with his apparent ignorance. (VOY: "Non Sequitur")
- Since this event and this discussion occurred in an alternate timeline, it is unknown if this type of plasma exists in our current timeline. It has not been mentioned in any episode before or after this one.