Abadox

Abadox is a Nintendo game, subtitled "The Deadly Inner War," in which the player, as Second Lieutenant Nazal, battles an alien, Parasitis, that has engulfed the entire planet Abadox and assumed its shape. He must fly into the alien's body in an attempt to rescue the swallowed Princess Maria. There are six stages, each divided into two parts:

• Stage 1 – Surface/Mouth
• Stage 2 – Throat/Esophagus
• Stage 3 – Forest of blue nerves/Inner sanctum
• Stage 4 – Stomach/Final digestive chamber
• Stage 5 – Intestine/Nerve center
• Stage 6 – Tube of death/Core

Reference

• Abadox – The Deadly Inner War Instruction Manual.