S1·E21 The Tombstone of Dry Leaves

The 999 arrives at a hollow planet with no gravity; as a result everything is a lot fatter looking, and can float through the air. Tetsuro and Maetel are confronted by cattle keepers but are able to escape. As they travel to their next planet Tetsuro meets an artist who has a wooden machine body. When they travel through a planet full of leaves, an electric mushroom threatens to destroy the train.