Quintessa (planet)

Quintessa is the home planet of the Quintessons. It is also home to various deadly robotic creatures, all as twisted and malevolent as the Quintessons themselves.

U.S. Cartoon continuity
While fleeing the forces of Galvatron, a shuttle containing Hot Rod, Kup, and the Dinobots crash-landed on Quintessa. Kup and Hot Rod narrowly escaped death at the tentacles of a giant squid, but escaped only to be captured by Sharkticons. While imprisoned, they encountered Kranix, last survivor of Lithone, who managed to warn them of Unicron before he was tried and executed by the Quintessons. The Autobots were also tried and sentenced to death. but fought their way out of the Sharkticon pit and, with the aid of the Dinobots and their new ally Wheelie, defeated the Sharkticons and turned the surviving creatures against their masters. Stealing a Quintesson ship, the Autobots escaped the planet. The Transformers: The Movie

Shortly afterwards, Kup, Ultra Magnus, and Spike Witwicky were kidnapped from the Intergalactic Olympics and taken to Quintessa, where they were tried and sentenced to death. Before they could be devoured, Hot Rod, Grimlock, Arcee, Springer, and the Aerialbots mounted a daring rescue. Determined to destroy the Autobots, the Quintessons evacuated the planet and initiated its self-destruct sequence. While Quintessa was blown to atoms, the Autobots survived. Five Faces of Darkness, Part 2

Marvel Comics continuity
(Note: Events from the UK-only comic stories are in italics.)

''The Quintesson homeworld in the Marvel UK comics was simply known as 'Quintesson'. In 2008, it was swallowed up by a time-space fault that was the result of Cyclonus and Scourge's time-travel activities. The Quintessons had planned to turn Cybertron (or another robot planet) into a new homeworld, but they were unsuccessful. Neither Quintesson nor its inhabitants were seen after this point, the former quite possibly destroyed.'' [http://transformers.wikia.com/wiki/Space_Pirates! Space Pirates!]

Dreamwave Comics continuity
From their citadel on Quintessa, several Quintessons studied recent activity on Cybertron, and prepared for the coming of Unicron.

(Note: The planet Quintessa also seemed to appear in orbit around Cybertron in Destined For Nothing, but this is in fact an ambiguously-drawn Astrotrain.)

Transformers Animated continuity
Swindle, with a very salesman-like attitude, remarks that he picked up an item on Quintessa that jams alarms and creates stasis fields. Decepticon Air