An injured pilot is spotted in the jungle and brought to hospital. Still in a state of confusion, he repeats seeing a huge man-eating plant demanding sacrifice in the remote Massau Badlands. This is put down to delirium, but an explorer becomes interested and arranges a safari.

A female magazine journalist also smells a scoop and gate-crashes the safari, but soon their guides disappear and they fall into the clutches of the Massau. A rumour-curious Phantom is already on his way to the village to investigate, but will he be in time to prevent the next gruesome sacrifice?...