An international consortium of scientists, operating as Project Inner Space in Tanganyika, Africa, is trying to tap into the Earth’s geothermal energy by drilling a very deep hole down to the Earth’s core. The scientists are foiled by an extremely dense layer of material at the boundary between the two. To penetrate the barrier and reach the magma below, they intend to detonate an atomic device at the bottom of the hole.
The film opens with two men from an unnamed ministry commenting a spate of letters from a beekeeper claiming to have developed a strain of killer bees. They dismiss him as a lunatic, though his letters claim he will start killing people if he is not taken seriously.
Miriam Wilkins (Mona Freeman) is as usual trying to help more than her family can bear. She has founded an association for rehabilitation of former prisoners. Her father is honorary president without knowing it. As one convicted, Mr. Baxter, is set free on parole she sees the opportunity for her association to get in action. She hires Baxter as gardener letting him live in their house (over the garage). As it turns out his conviction had been inflicted him by Judge Wilkins, now senator, the situation in the house gets a bit chaotic.
A commander struggles with doubts when he and his team are assigned to a Mars mission.
An expedition from Tokyo heads to Obelisk Island, which a greedy entrepreneur (Mr. Funazu, the President of Playmate Magazine) wants to turn into an island resort. But the Japanese monsters have other ideas.
A professor is suspected of murdering a young woman after conducting an experiment with about how appearances can be deceiving.