ジャングルの惑星にそびえる巨大な頭蓋骨の中に築かれたエイリアン都市

A Giant Alien City on a lush, steamy jungle alien planet. The city is created out of a partially buried giant alien skull that is extremely elongated and has long hollow eye sockets. Part of the skull is removed where communications dishes and antenna protrude. The planet is under attack by the evil cosmic overlord and his shock troops. Done in a dymanic and colorful hard science fiction style