As the aliens are losing the fight and dying off they decide to use spores to kill off all native life on Earth.

Kinkaid's brother Max had disappeared during their last mission prior to Kinkaid running into the Blackwood team. Now, the team stumbles across an imprisoned Max while infiltrating an alien stronghold and rescue him. Unknown to the team, Max has been transformed into a Robocop-like entity programmed to execute Kinkaid.

Debi is caught up in a fight simulation developed by the aliens to study human creativity.

The aliens plan to clone a popular motivational speaker in order to control the minds of the rich and powerful. Suzanne and Harrison plan to capture an alien drone.

In the midst of the post apocalyptic future, the team decide to throw a birthday party for Debi. Meanwhile, the Morthren attempt to locate their malfunctioning "seeing-eye" device (a self-controlled drone), which has run amok through the city.

The Morthren manipulate a Corporate magnate (by seemingly restoring his health) into selling them a top city newspaper he controls, to give the aliens a tool for propaganda.

A revolutionary "med cell" is created that could save countless lives. But fearing that the Morthrens could turn it into something deadly, the Blackwood team tries to get their hands on it first. Meanwhile, Malzor desperately tries to acquire it to heal a dying Mana, his second-in-command.

The alien embryo created on the "Breeding Ground" episode has now grown and is now a pre-adolescent in human terms (named "Adam"), residing in a special school occupied by human children with exceptional IQ's, secretly run by the Morthren. The aliens have nefarious plans for the children.

The Morthren have developed a time machine. Malzor travels back to 1953 to inject his invading predecessors with an immunity drug to Earth's bacteria so they'll complete their original mission of obliterating mankind and colonizing the planet. Blackwood and Kinkaid arrive at the alien's research facility and follow Malzor into the past to try and stop him.

When an alien weapon intended to kill humans via computer systems backfires, its creator, Kemo, is maimed in the process and then sentenced to death for his incompetence. Having developed human emotions as a result of his accident, Kemo teams with Kincaid to destroy the weapon.

The aliens develop a new drug made from human brain tissue, planning to use it to control human society.

Suzanne takes Debi to live on her family's farm but is unaware that the Morthren are already there trying to sort out their food shortages.

A young Morthren rebels against his people so runs away to live amongst humans and ends up becoming friends with Debi.

Mana forces a dying surgeon to conduct experiments on patients in his hospital, attempting to implant alien embryos into human hosts.

The aliens take over the members of a punk rock band and add a secret electronic signal to their music which will drive young people into a violent frenzy. Meanwhile Kincaid begins a romance with his late brother's girlfriend.

When a severe heat wave strikes, the aliens cut off the city's water supply and exploit a local reverend to drive humans into worshiping the Morthren Eternal.

The remaining members of the team set up a new home and try to deal with their grief. The Morthren also have to find a fresh refuge and as part of this they kidnap and duplicate a priest who runs a homeless shelter.

A new, more advanced generation of aliens known as the Morthren arrive on Earth. Dr Blackwood is saved from a kidnapping by a renegade soldier called John Kincaid. After executing the original alien invaders for failing to conquer humanity, the Morthren aim to destroy Blackwood's team with a clone of Colonel Ironhorse.