A new dwelling is growing fast on the edge of the jungle after a number of uranium claims in the area start to attract attention from other prospectors. However, the town is soon taken over by claim-jumpers who start acting as law-enforcers to protect their racket.

After having saved one of the gang's reluctant victims from certain death, the Phantom is soon heading for U-Town to restore law and order, but he gets more than he has bargained for when the gang strikes back and buries the Phantom alive in a disused mine...