A fragment of a powerful radioactive element called Ormondium is stolen by foreign agents. Captain Midnight are caleld upon to recover the stolen materials.
Captain Midnight's friend Dereck Strange invites him to witness the test of a new guided missile: the Nike. When Strange does not show up for the test, Midnight and Ikky go to his apartment and learn he has been kidnapped. Enemy agents use drugs of Strange to get the secrets of the missle. After getting the information, the enemy agents put an unconscious Strange on a drone plane about to be destroyed in an Air Force Test. Only Midnight's intervention saves Strange's life and captures the enemy agents.
Captain Midnight and the Secret Squadron track down a dangerous group of diamond smugglers. The assignment is made easier with the help of one of Tut's inventions, an Omni Counter, which reacts to precious gems and metals.
An astronomer dies after discovering a lost moon closely orbiting the Earth. Captain Midnight and enemy agents contend for the astronomer's secret with both sides aware that whichever power reaches the lost moon in space first will control the earth.
Captain Midnight investigates the poisoning of a small dog belonging to a member of the Secret Squadron. The investigation leads to the solution of a bank robbery and the near death of Captain Midnight when he is imprisoned in a cold storage locker.
Captain Midnight goes behind the Iron Curtain to the country of Balkavia. He is there to rescue Zabor, a freedom fighter. Midnight succeeds in his mission but at the final moment Zabor elects to remain in his own country and continue the fight for democracy.
Captain Midnight and Ikky go undercover gehind prison bars to learn the secret of a series of prison riots. Another riot leads to Captain Midnight and Ikky escaping along with a band of prisoners. The Secret Squadron learns that the riots are part of a foreign plot against the United States.
When counterfeit bills begin to flood into the United States, Captain Midnight discovers that a trucking company is being used as a means of distribution.
A frantic squadron member asks for Captain Midnight's help. He needs help in exorcising a dangerous ghost. Midnight, Ikky, and Tut set up an electronic perimeter around the Southern mansion that is ""haunted"" by a ghost and discover a foreign agent plotting to use it as a rendezvous site.
Captain Midnight and Ikky pay a visit to Tut who is busy in Africa collecting rare plant and soil samples. Hoping for a peaceful vacation, the Secre Squadron instead encounters the mystery of a stolen idol, a plot to foment native unrest, and a rich uranium deposit.
Captain Midnight goes to the bottom of the ocean to search for an experimental missle that has disappeared. An enemy submarine is detected hiding underwater.
The queen of a small island named Luana withdraws her permission for the US to conduct atomic tests in her territory. Captain Midnight and Ikky are sent in to discover the reason why.
Captain Midnight is brought to Egypt by the daughter of an eminent archaeologist. He investigates the archaeologist's mysterious disappearance and the curse of the pharaohs.
Captain Midnight helps a group of Secret Squadron members who have been evicted from their club house by a commercial developer. In the process, Captain Midnight discovers a bank robbery.
An eminent refugee scientists asks that Secret Squadron headquarters be put at his disposal while he perfects his new process. The scientist is working on a countermeasure against the Radioactive Dust bomb. The process requires that the scientist be exposed to high levels of electrical energy. When the scientist exceeds tolerable limits of electricity, he comes incredibly dangerous.
Captain Midnight sponsors a youth gym as a way to combat juvenile delinquency. One of the youngsters named Tommy Venters is impressed with the lifestyle of a poolroom owner.
The Secret Squadron laboratory is placed at the disposal of a scientist working on a heat-resistant metal needed by the Air Force. The research is stymied by a vindictive scientist who develops a sonic gun and hates the other scientist.
A group of gamblers try to bribe a star quarterback into throwing an important game. The young player is in need of cash for an operation for his sister, but he refuses to participate in the scheme. In retaliation, both the quarterback and Captain Midnight are kidnapped.
A young refugee from behind the Iron Curtain asks Captain Midnight for asylum. What Captain Midnight does not know is that the boy has been programmed to spy on a secret weapon being developed at Midnight's laboratory. Acting under hypnosis the boy sabotages the weapon. At the last moment the boy fights off the hypnosis and provides Captain Midnight with the information necessary to save Secret Squadron headquarters and to defeat the foreign agents behind the plot.
A munitions genius is released from jail and plots revenge against Captain Midnight and the police responsible for his conviction.
Captain Midnight goes to India to deliver a goodwill message at the invitation of Bengra Tassi. When Captain Midnight and Ikky get to India they discover Tassi has been kidnapped by ""The Executioner"". Captain Midnight must rescue Tassi before it is too late.
Captain Midnight and Ikky are returning from a mission to the North Pole. They are persuaded to fly a sick Eskimo to a medical facility. When they get to the Eskimo's remote cabin, they are taken hostage by enemy agents.
Captain Midnight and Ikky go to timber country in the Pacific Northwest in order to investigate the largest non-nuclear explosion in history. They pose as lumberjacks and uncover a chemical compound which when added to wood creates a cheap and powerful explosion. Captain Midnight must stop the men behind the chemical or the balance of power in the world may be altered.
A gem warfare attack is planned against the United States by one of America's Cold War enemies. Captain Midnight is called upon to recover a missing formula which can protect the country from the virus.
Captain Midnight investigates the kidnapping of a Secret Squadron member and her father who is a famous scientist who has developed a method of creating hurricanes.
On a mission to Alaska, Captain Midnight and Ikky respond to a Mayday message. They make a landing in the remote northwest and discover a cabin where a renegade scientist is experimenting with an anti-magnetic force which is intended to form the basis of a military attack against the United States.