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Humanity must resume its war against the Martians when they revive after decades of hibernation following their defeat in the 1950s.

The Blackwood team consults with noted linguist Adrian Bouchard (Cedric Smith) to decipher the aliens' transmissions.

A noted scientist and old friend of Suzanne's, Dr. Erik Von Deer, is being brain-washed (through signals subliminally implanted in the music of his favorite artist) into secretly working on a serum that will give the aliens immunity to Earth's bacteria. Suzanne arrives for a weekend visit while Von Deer is on the verge of the serum's completion.

Many centuries ago, one alien ship crashed on earth. The surviving aliens were defeated by a local Indian tribe. The modern day aliens attempt to acquire the ship to assist in their subjugation of the planet.

Wanting to set off a "tribal war" within the human race, the aliens attempt to detonate a nuclear bomb at a U.S.-Soviet disarmament summit.

Suzanne learns that a friend of hers has disappeared from his college campus. Meanwhile the aliens are on campus in search of a bio-weapon.

The Blackwood Project investigates individuals who claim to have had "close encounters". The team stumbles onto an alien plot involving implanting something into victims' bodies for the study of the human immune system, setting them free and collecting them later to learn the results. Harrison ends up dating one of the victims, Karen McKinney.

The aliens are forced to move their unborn infants to a refrigeration facility to save them. Meanwhile Suzanne's ex-husband, an investigative journalist appears, seeking to uncover the truth about the Blackwood project.

The team set up in Chicago to investigate a spate of kidnappings but encounter resistance from the local police. Nevertheless they discover a research colony of alien scientists occupying an abandoned prison, trying to create a designer drug which turns addicts into frenzied killers.

A competing alien race sends an assassin to eliminate the invading force and to protect humanity.

Suzanne does some unauthorized research on a new kind of grain that will grow in any climate. The billionaire who invented wants to sell it to the world. Thinking poorer countries will be given money by richer countries. But the aliens have their own plans for the grain, after placing a new deadly poison in the grain, they take over the body of the billionaire who suddenly offers it free to the world.

The team act as watchdogs protecting a secret and unprecedented meeting of international alien experts, where they suspect one of them may be an alien.

The aliens plan to disorganise human society by paralysing its means of communication.

Harrison is kidnapped by a unique modern artist named "Quinn", who's actually one of the aliens being hunted by his kind. He's mysteriously immune to Earth's bacteria, so the other aliens want to learn his secret through dissection. Quinn wants to set up a dialogue with Earth's leaders to arrange a "peaceful" takeover of the planet as opposed to an all-out slaughter of humanity.

Near an isolated nuclear research facility an alien scout ship is discovered. As the team arrives and set up their operations, command of the find is handed over to Colonel Alexander and his mysterious Project 9.

The Martians encounter another human disease, chicken pox which is crippling their invasion plans. They decide by harvesting human brains so they can produce a cure that will put the invasion back on track. Harrison's team race against time to stop them completing their project.

To escape capture, an alien merges with a pregnant woman. This causes unexpected consequences for the aliens, and for Blackwood's team - and violence for the hospital staff when the woman/alien goes into labor.

The aliens organise a series of armoured car heists in order to finance the purchase of rubies for their new laser weapons. Meanwhile, Ironhorse is kidnapped by the vengeful husband of a woman who had accidentally been shot dead (by Ironhorse himself) during a raid on a research installation that had been invaded by aliens.