Timeless River

The Timeless River is a world from Kingdom Hearts 2.

When Sora stepped into the door in the Hall of the Cornerstone, a surprise awaited him on the other side. The door took him back in time to when the world was still monochrome--and to before Disney Castle was built! Based on Vault Disney and, in most cases, Steamboat Willie, the Disney Castle of the past is known as the Timeless River.

The strange, twisted magic of the Timeless River made all those that entered via the door go back to their youth. Donald Duck became a monochrome version of how he looked in The Wise Little Hen. Goofy became how he looked in his first cartoon as well. Sora, on the other hand, became a cartoonish version of how he looked in Kingdom Hearts.

With Pete's coming to the Timeless River, Heartless invaded the sacred land and captured the Cornerstone of Light. Because of this, the Disney Castle in the future became vulnerable to the Heartless. The Heartless found in the Timeless River are surrealistic and bizarre. Many of them are toy-like. Instances include the Hot Rod, which is a cartoonish car, and the Aeroplane, which is a toy airplane.

Sora and his friends encountered the Mickey Mouse of the past several times, along with the good Pete of the past. The boss of the Timeless River was Pete from the future (Pete from the past helped Sora in the battle).