Jove was a telepathic entity that lived in the atmosphere of Jupiter.
Before the 26th century, the entity was not sentient. When Thom Kelligan was sent to contact it, he was mentally overwhelmed and absorbed by the creature. Now self-aware and a gestalt, it fought to preserve itself from being destroyed by Hepton. Norma Kelligan sacrificed herself to join with the entity and her husband's consciousness. The strengthened gestalt telepathically killed Hepton. The Sixth Doctor told the surviving Lorannan-Ycole Corporation gas dredgers they could now make peaceful contact with the entity, which he dubbed Jove. (PROSE: Jupiter)