An elite team of medical and scientific specialists race to save a top government scientist who is suffering from a blood clot on the brain. Their mission is to be reduced, along with their craft, to microscope size, and to enter the bloodstream to save him.

Governments and scientists race to unravel the mystery behind a visitor's appearance. Dr. Helen Benson is a renowned scientist who finds herself face-to-face with an alien called Klaatu. Klaatu has traveled across the universe to warn of an impending global crisis. She quickly discovers the deadly ramificications of Klaatu's claim that he is a 'friend to the Earth.' Now, she and her yourng stepson must find a way to convince the entity who was sent...

He walks through walls of solid steel and stone into the fourth dimension. Scientific whiz Tony Nelson has made an amazing discovery. He has developed a method of stimulating the molecular structure of objects so that they can be joined or passed through one another. Stumbling upon his incredible secret is Tony's older brother, Scott, a fellow scientist who decides to take the experiment one step further. Soon he is able to pass himself through doors...

On a search to find the center of the Earth, Trevor Anderson, his nephew, and their tour guide make a breakthrough discovery that launches them on a thrilling journey into the unknown.