Venom

From the Super Mario Wiki

Venom.

Venom is a Planet in the Lylat System that stared in the Star Fox Series, as well as Super Smash Bros. Melee. Much like Corneria, The stage is actually the Great Fox flying over the surface. But unlike Corneria the stage is fought on the Great Fox's four wings.

The Star Fox Team in Arwings will show up and opens fire, these blast are very powerful. When the Great Fox flies through the damp cave, sometimes the player will be knocked off and be KO'd. Also because of the shape of the ship most items will fall inward, or off the stage.

At one point in the stage, the Great Fox goes into a cave. While in the cave, if you are sent flying diagonally, you can hit the wall of the cave and survive.