When a friend moves to San Francisco, Carl and Annette Borden agree to take her Great Dane, Cassandra. Carl gets along wonderfully with the dog, but the beast doesn't seem to take well to Annette. Carl is a writer, Annette an artist who works with clay. She's also an artist in the kitchen, where some serious domestic trouble is about to begin. Meanwhile, Cassandra lives up to her name.

To avoid the life-threatening dangers of manned space exploration, Professor Nordstrom creates highly advanced form of artificial intelligence capable of piloting a starship to other worlds. In order to transmit alien data, the extraordinary robot is infused with a powerful telepathic device that enables it to instantly read and even feel emotions. Danger strikes when a sinister band of covert agents kidnaps Gadge, the professor's 10-year-old grandson. But Gadge has a powerful ally. For he has developed a psychic, emotional bond with his grandfather's robot. And now Gadge's captors must suffer the wrath of his protective friend. They must face a mechanical monstrosity bent on a killing rampage of revenge and destruction.