Experimenting on making guinea pigs invisible by lowering their refractive index to that of air, Dr. Peter Brady becomes invisible himself after a radioactive leak. Brady becomes front page news and a target for a ruthless criminal gang who kidnap Sally, forcing Brady to use his invisibility to steal £50,000 from a bank in order to pay the ransom for her safe return.
Scientist Peter Brady is inadvertently rendered invisible during a botched lab experiment.
Military Intelligence asks Peter to undertake a mission to rescue an intelligence operative. To free the man, Peter and a local resistance fighter must breach the high-security hospital and get the operative out.
A disfigured millionaire asks Peter to help turn him invisible, but he has an ulterior motive.
Peter must infiltrate an embassy to rescue a Russian scientist who wants to defect.
Peter's existence as an invisible man becomes public knowledge, while Sally's friend needs help when her stepfather plots to kill her mother.
An actress runs down a hobo by accident, but a blackmailer threatens to expose her secret.
Peter must board a Russian trawler to rescue a sailor who wants to defect.
Diane becomes convinced that the inner-lining of an airplane passenger's fur coat is being used for smuggling purposes.
When an airline pilot is framed for drug smuggling, a killer comes to his home to silence him... and the pilot's blind wife is the only witness.
Peter vows to help an innocent men unjustly sentenced to prison for a crime he didn't commit.
A gang abducts Sally and uses her to force Peter to steal for them.
A gangster forces one of Peter's staff to developed a mathematical system to win at the roulette table.
A wealthy man uses extortion and a trained attack dog to force Peter to kill his partner and make it look like a heart attack.
When a friend of Peter's, Scott, attempts to perfect his fuel diffuser, four pilots are killed in four separate test flights. Peter steps in to determine if sabotage is involved and who on Scott's team may be responsible.
An escaped mental patient comes to Peter, asking for his help to get her boyfriend cleared of a murder charge.
A spy kills a British professor and steals an important file, and Peter travels to Amsterdam to help recover it.
Peter must rescue a writer being held for speaking out against her repressive government.
An important scientist decides to walk away from his ground breaking research just as he makes an important discovery. Brady must locate him and convince him to return to his work before foreign agents step in and steal his secrets.
Identical twin sister entertainers visit London as guests of the government. Brady becomes involved when one of the sisters disappears, and there seems to be a possibly spy scandal behind the disappearance.
A family is gunned down by terrorists in an Italian market. This sparks an investigation into how these people get the guns. The invisible man is tasked with breaking up the gun running activity.
The invisible man becomes involved in an investigation after a woman in France reports seeing a white rabbit magically appears in a field.
The Invisible man is investigating an international doping ring when his identity is stolen and used to smuggle drugs.
The Invisible Man tries to protect the heir to an Arab throne (a student of his) from a power grab engineered by the Commanding General of his Army.
The movement of a top secret rocket is compromised when of the scientists runs into gambling debts. The Invisible man realizes what might be happening and heads out on a desperate search for the missing rocket.
The invisible man is called in after a malfunction with a light sensitive bomb. Brady must somehow disarm the weapon before approaching darkness makes detonation inevitable.
Authorities become alarmed when they realize parts of an atomic bomb are found among the baggage from a crashed airliner. The Invisible man is tasked with finding out the source of the parts.