Dr. John Brady is working at the Castle Hill government laboratory investigating the nature of refraction - his experiments achieve success when he is able to make a rat become invisible - but a leak in the containment chamber releases the radation into the lab, and Brady finds himself rendered completely invisible as well. At first put under lock and key by the government, he escapes and runs to his former colleague Dr. Crompton for help, but finds that the powers of invisibility have the potential to corrupt...

The first episode begins very quickly, with Brady becoming invisible in the first moments. Fortunately they give time to introduce and develop Brady and his family before the action starts - already however, the 25 minute runtimes of these episodes starts to show itself, and the pacing does seem a little rushed.