This is the evil Bosconian Space Station. It spawns out space fighter ships and seek and destroy their enemies. This space station consists of 6 mini-station. This is why the station is shaped like a hexagon.
Inside, the Bosconian has hired minions to do their evil bidding:
Ghosts (From Pac-Man)
Pooka
Frygar
Shroob
Spiny Shroopa
Tashrooba
Spania
Robot Octorok
ChuChu
Meta Sword
Meta Chain