Tylium was a substance used as a power source.

The primary reactor coils on Quarra processed more than 8,000 metric tons of tylium per second, with a 94% thermal efficiency. (VOY: "Workforce")

The Hirogen utilized a tylium-based power source for their ships and training facilities . (VOY: "Flesh and Blood")

Tylium was also a fuel used in both the 1978 and 2004 versions of Battlestar Galactica. (Star Trek Encyclopedia (4th ed., vol. 2, p. 431))
Community content is available under CC-BY-NC unless otherwise noted.