Action Comics #220
Bill and Janu stumble into a lost underground world full of prehistoric animals and primitive cave men. Bill teaches the men some fundamentals which will make their lives easier, such as the wheel and simple irrigation. The existence of this unlikely habitat is explained when Bill finds a set of photographs, which reveal that the animals were stranded on Earth when a ship belonging to some inter-planetary cowboys was forced off-course.
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Bill and Janu stumble into a lost underground world full of prehistoric animals and primitive cave men. Bill teaches the men some fundamentals which will make their lives easier, such as the wheel and simple irrigation. The existence of this unlikely habitat is explained when Bill finds a set of photographs, which reveal that the animals were stranded on Earth when a ship belonging to some inter-planetary cowboys was forced off-course.
Plot details indexed by the Grand Comics Database (CC BY-SA).