A Plazmite is a species found in Metroid Prime for the GameCube. They can be found on Tallon IV, which is currently the only planet where they appear to live. In the game, they eject rays of light from their body by releasing thermal energy, a feature that was present in certain species in Super Metroid. They're relatively harmless, though if they're destroyed, they'll release a harmful substance. Also, because they are always found in dark areas, it's suggested that you don't destroy them, as afterwards the room will be dramatically darkened.