The Drella of the planet Alpha Carinae V derived nourishment from the emotion of love. The Drella existed without form in the conventional sense, and were a mass of energy of highly cohesive electromagnetic fields. The were very similar to the mellitus, a gas cloud creature from Alpha Majoris I, and Redjac, a creature that existed for centuries by journeying from planet to planet, including Earth, Mars, Alpha Eridani II, Rigel IV, Argelius II, and Deneb II. (TOS: "Wolf in the Fold")