Goo Number 8739-B
Goo #8739B (also known simply as Goo) is a planetoid composed almost entirely of a sticky gum-like substance. It's used as a Garbage Disposal of sorts, and has apparent connections to the Junkions. You can move through it easily enough... but getting out of it is another matter altogether.
Fiction
Generation 1 cartoon
The Autobots Rodimus Prime, Ultra Magnus, Springer, the Aerialbots and Arcee, as well as Spike Witwicky and a Quintesson crashed on Goo, after fleeing the destruction of Quintessa.
On Goo, Springer was caught and dismantled by an alien garbage truck. Searching for the means to "shut off the goo" -- to deactivate the energy fields that kept it warm and sticky -- the Autobots came across a control facility where they made contact with Wreck-Gar. When the Autobots were later attacked by a large force of Decepticons, Wreck-Gar came to their rescue. The Junkion leader used a specialized ship to melt the goo out from under them, and vacuum the Autobots inside.
Stymied by the escape of his quarry, Galvatron destroyed the entire planetoid in a fit of rage. 'Cause he can do that apparently.
Goo -- or a twin -- was sighted again in the episode Chaos, where after shutting off the energy fields, the Autobots were able to walk freely on its surface. Whether this is the same Goo or another planetoid like it is unknown, though the number designation of the original planetoid would imply that there are thousands of the little garbage magnets.
