Plasma was a state of matter.

The Mandragora Helix was composed of ionised plasma. (TV: The Masque of Mandragora)

When the Tantane Spaceport became locked down, the Wailers concentrated plasma fire on its force field for 400 years, causing the atmosphere to dissipate. (AUDIO: Spaceport Fear)

A fusion scoop was a means of accessing power by harvesting plasma from a star's surface. (TV: 42)

The plasma lab on the Pollyanna was used to store and study plasma. (COMIC: The Eye of Torment)