The Garbage Monster first appeared in the episode The Widening Gyre as the main villain in the episode.
As people continued to dump trash into the Pacific Ocean, the currents swept the garbage together until the garbage pile (now called the Pacific Garbage Vortex) ended up being twice the size of Texas. The governments of the world tried to rid of it by dropping a missile containing a plastic eating bacteria on it, but the plan backfired when the bacteria mutated and fused with the garbage, bringing it to life.
He resembles P'andor's true form, but instead of living radiation and energy, he's a living garbage pile.
Powers and Abilities
His basic ability is to manipulate the garbage on or around him.
He is shown to have enough strength to hold his own and throw Way Big around.
When losing a limb, he can simply regenerate with the seemingly infinite garbage at his disposal.
He can change his own size by adding the previously stated massive piles of garbage.