- You may be looking for the concept of immortality.
Although the name of "immortal" could be used in reference to any individual who possessed immortality of some sort, (TV: The Woman Who Lived, Hell Bent, Can You Hear Me?) "the Immortals" was also the designation of a specific species of god-like beings.
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)
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)