H.G. Wells, his fiancee Jane, and T.H. Huxley agree to participate in the secret super-science work of Britain's Imperial Institute. Accidentally propelled into space, the trio hear of the Martians' earlier enslavement of the hive-mind Selenites from their leader, the Grand Lunar. Proceeding to Mars, they trigger a revolt among the Selenites and learn of the Martian's invasion plans for Earth.