Alternate timeline
(covers information from an alternate timeline)
USS Yellowstone

The Yellowstone venting tetryon plasma

Tetryon plasma was a variety of warp plasma that emitted multiflux gamma radiation. A vessel equipped with normal warp drive could stall out when passing through a cloud of tetryon plasma.

In 2371 of 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. Later, Kim and Tom Paris used the stolen Yellowstone’s plasma to briefly stall the engines of a Nebula-class starship. (VOY: "Non Sequitur")

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