While trying to unlock the secrets to invisibility, British scientist Peter Brady (Tim Turner) suffers a tragic accident that leaves him permanently invisible. With no antidote in sight, Brady becomes an accidental superhero, protecting the British government from spies and saving ordinary citizens from danger. Loosely based on the classic 1897 H.G. Wells novella of the same name, the television series introduces espionage and heroism to Wells' tragic science fiction.