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 …

When a British agent is captured in a hostile Middle Eastern country, the government fear that his knowledge of the resistance movement there could place all its members in jeopardy. They call on Brady to rescue the agent from a tightly gua…

Brady is working hard to find a cure for his invisibility but needs a human volunteer. He is tricked into travelling to the house of the exiled South American industrialist Raphael Constantine. Hideously scarred by a grenade the man appeals…

An outspoken Russian scientist speaking in London is kidnapped by secret agents and locked up in the embassy. Brady follows her and breaks into the embassy before beginning a diplomatic attempt to have her freed. When this fails he sneaks h…

After a serious car accident witnessed by many people, the government reveal Brady's invisibility to the press and he becomes a near-celebrity figure hounded by the media. Meanwhile the friend of his young niece begins to suspect that her s…

Barbara Crane, a respected theatre actress, finds herself the subject of bribery after accidentally running down a man on a clifftop road. Worried by the events she starts to perform badly, and a suspicious Brady decides to investigate furt…

A Russian sailor makes a bid for freedom from a trawler at anchor in a British harbour, but is soon captured and taken back to the ship. The head of the refugee committee appeals to Brady to help them and although reluctant to assist, he so…

A group of criminals raid an important British atomic laboratory and photograph some key documents onto microfilm. When the customs officers quickly clamp down on passengers leaving the country, one of the men hides the film in the mink coa…

When an airline pilot is framed for importing drugs into the country, he phones his old friend Peter Brady for help. Before Brady arrives however, the pilot is shot and badly injured in front of his wife, who is blind. Brady helps the polic…

When the reformed career criminal is framed for an armed robbery and sent to prison again, he is determined to get free and prove his innocence and escapes 5 times before being recaptured. Curious about the story, Brady decides to investiga…

Brady's fame leads to trouble when a group of criminals kidnap his young niece and hold her hostage - forcing Brady to commit a bank robbery.

When one of Brady's colleagues announces that he will not be returning from his holiday in Italy, and is seen using his mathematical talents to win at roulette, Brady decides to fly out and convince him to return - but he soon discovers tha…

After his bag of documents was stolen, Brady is kidnapped by a mysterious man who wants him to commit a murder - and to keep the unseen Brady in check, he has a vicious guard dog who can sniff out and catch even an invisible man.