An alien spy places his mind in a robot sent to Earth, hoping to be taken in for study. He gains access to data on Earth technology, but the scientists turn his robot body off, trapping him.; A couple vacationing in Africa find a dinosaur egg that hatches a live tyrannosaur. The dinosaur terrifies the villagers, but eventually dies in a landslide.; An engineer attempts to build a tunnel from America to Europe but it is destroyed by inhuman creatures living in an undersea city.; A criminal accidentally makes a teleporter and uses it to commit incredible burglaries, until a clever cop sets a trap for him.; A foreign spy escapes capture by using a time machine to flee to the 18th century, but finds that he has assumed the identity of Benedict Arnold and will be executed in his place.