Back Cover Blurb — Dell
MARK HARRIS LOOKED LIKE A MAN...

But seven miles below the surface — without diving gear or breathing apparatus — he moved along the ocean floor like the sea-being he was. Before him a door opened in the side of an underwater mountain to reveal a sinister threat to the terrestrial world.

A power-hungry genius had lured the best scientific minds in the world to his secret laboratory in the impenetrable depths of the sea. There he had created a computerized war machine which could wipe out life on earth and establish him king of an underwater empire.

Only Mark Harris could penetrate his infernal habitat to save life on earth...the earth where man breathed air...the earth which was not his home.

Back Cover Blurb — Granada
SUPERMAN FROM UNDER THE SEA

They found him on a lonely Pacific shore and nursed him back to life, observed him, wondered at him. Without water for his gill-like lungs, his shore life is limited to a few hours, but under the waves he is lightning fast, immensely powerful — a seabound superman.

He has no name, so they call him Mark Harris. The Man from Atlantis — the phenomenon who will become the world's first underwater secret agent.

Here is the Man from Atlantis' perilous first mission. Mark's task: to recover a top-secret, fantastically sophisticated deep-diving submarine from 35,000 feet beneath the sea — and to defeat a madman plotting the destruction of the world from a hideout on the ocean floor...

Back Cover Blurb — Dell
VIOLENTLY, THEY ACQUIRED HUMAN BODIES...
WARILY THEY EMERGED FROM THE WATER ONTO THE ALIEN LAND.

Male and female. Positive and negative. With hands linked, they formed a deadly weapon capable of delivering a lethal high-voltage electric shock to anyone, anything, they touched. Fear made them hostile, dangerous.

Recognizing himself in them, fascinated by the lovely Lioa, Mark Harris was irresistibly drawn into their charged current. They alone could tell him where he had come from, who he was.

But he had not reckoned on the forces that would compel him, calling him to complete a desperate alien mission, threatening the fragile new bond he had forged with the Earth...with men.

Back Cover Blurb — Granada
SEABOUND SUPERMAN —
AGAINST THE ELECTRIC INVADERS

A new and dangerous mission for Mark Harris, the Man from Atlantis, and the team at the Foundation for Oceanic Research.

Soon after a strange craft is found crashed at the bottom of the sea, reports start coming in of a strange pair of beings, one male, one female, who look like Mark — and whose electrically-charged bodies can kill or stun just by touching.

Can they be from Mark's forgotten home? Are their intentions good or evil? The man from Atlantis is faced with a terrible clash of loyalties as he hunts them through sea and land...

Back Cover Blurb
AN UNCANNY SCREAM BROKE THE SILENCE OF THE DEEP

The dread moment had arrived. A space probe had carried back alien spores. Active, intelligent, indestructible, they were unlike anything science had known before. Invading human bodies, creating havoc and madness, they made Mark Harris know he would serve their will. The alternative was too overwhelming to consider — not just for him, for all mankind. The spores had come. The earth was their hostage. There was only one way to send them back — but time was running out...

Back Cover Blurb
FAMOUS SCIENTISTS WERE DISAPPEARING, SEEMINGLY INTO THIN AIR.

All the FBI had to go were a few scraps of paper. One bore the word "Felicitos". It rang a bell in Mark Harris's mind.

On a perilous rescue mission, the Man from Atlantis sped to a mysterious island off the coast of Brazil. There, in a sophisticated underground laboratory, a deranged woman scientist had concocted a potion that could make the greatest minds on earth serve her will.

Mark Harris was uniquely armed to meet the bizarre adventure that awaited him, an adventure that threatened to take the earth's intelligence out of the known world to a strange and overpowering new one.