Immortal

The Immortals were god-like beings.

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 like 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 Immortals believed they were related to humans and lived alongside them. They became known as gods and witches.

During World War II, 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)

In the far future, Ashildr informed the Doctor that all the immortals had died out. (TV: Hell Bent)