Helliax

The Helliax visited Earth in the 20th century and took the form of Jonathan, impregnating his widow, Annabel Morden, before leaving. In 1984, he heard his son, Adam's, telepathic call and returned to Earth, faking a crash landing and infiltrating the Morden Clinic. He, Annabel and Adam were ultimately taken to the Eye of Orion by the Fifth Doctor. (AUDIO: The Helliax Rift)