Immortal

The Immortals, or immortals, were a species of powerful beings who existed alongside humanity. Some were worshipped as gods, and made themselves known to the ancient Greeks. (PROSE: Deadly Reunion) The term "immortal" could also be applied more generally to anyone who possessed immortality of some sort. (TV: The Woman Who Lived, Hell Bent, Can You Hear Me?)

Biology
The Immortals were human-like in appearance, but could change their form. They had a wide range of powers. They could teleport themselves (though they had difficulty teleporting others), had psychic powers such as mind control and empathy and were difficult to kill. Individual Immortals had control over certain powers, such as Poseidon's control over the water. (PROSE: Deadly Reunion)

History
The origin of the Immortals was lost to time. Some believed that they were aliens from another planet, but Hermes considered it more likely that they were mutants native to Earth, and closely related to humans. Some Immortals who revealed their supernatural powers to humanity were burned as witches; others became known as gods.

In the aftermath of World War II, Second Lieutenant Alistair Gordon Lethbridge-Stewart was sent to Albania, where he met the Immortals and fell in love with Persephone. When she was kidnapped by Hades, he and Hermes went to rescue her.

In the 1970s, Hades tried to take over Hob's Haven with a wave of violence caused by Sarg. Persephone, Hermes and Demeter were able to combine their powers and contact Zeus, who banished Hades. (PROSE: Deadly Reunion)