Watch Earth: Final Conflict Season 4 in Australia

Lili Marquette gives birth to a half jaridian child, with the help of taelon core energy, that may be the last hope for the taelon and jaridian race. Auger goes into hiding from volunteer investigations, an old friend of his J Street agrees to help Liam and Renee while Auger is on the run. Sandoval tries to destroy evidence of the Jaridian existence.

A party for the new elite is in full swing at pro-Taelon Senator Edward Gale's posh Washington home when his daughter, Eva appears with a gun. She fires, wounding him in the arm before his security guards can subdue her. The next day, Liam Kincaid and Renee Palmer meet with a holographic messenger sent by Hubble Urick. He informs them of the shooting and tells them Eva is in the hospital, having tested positive for Kryss, a substance used by Taelons in small quantities to help them adapt to Earth's atmosphere. Liam is surprised and angry, as the Taelons' Kryss facility was shut down eight months before and the Taelons swore they found a way to synthesize Kryss without enslaving humans. Yet Eva, whom the messenger tells them disappeared three weeks before to take part in an archeological dig, must have been enslaved in a Kryss factory to have traces of the substance in her bloodstream. Liam and Renee must prove the factory is still operating.

Liam and Renee investigate Zo'or and his link to a biomedical facility's clandestine cloning operation.

The Murder of General T'Than on board the mothership leads Liam to descover the taelons darkest secret, while the late Jonathan Doors rturns in cyber form to addminister a deadly attack upon them.

While Liam and Renee investigate the suspicions of false imprisonment and infringement of civil rights, an ammoralist associate of Augur's plans to steal Zo'or's gold onboard the mothership.

The ANA manages to negotiate amnesty for all resistance members, Liam trys to convince resistence member Halley Simmons to take up the offer. Sandoval uses parasites to make volunteers do suicide missions against the resistance

The Taelons decide to leave earth following what appears to be an imminent Jaridian invasion.

Renee discovers that her younger brother is a victim to Zo'or's plot to harness human emotions.

While onboard the taelon mothership, Renee is taken hostage by a mysterious being that haunts the lower parts of ship.

Liam and Renee investigate a serial killer who murders people in their dreams.

Liam and Renee discover that a baby is born with a CVI implant.

Liam is implanted with a neural surveillance device to track Da'an, who leaves earth on a mysterious final journey.

The mothership is damaged when a peice of dark matter colides with it.

Zo'or threatens to attack the earth after an artifact containing the secret to synthesise taelon core energy is stolen from the mothership.

J Street learns a lesson in trust while on the run from Sandoval.

The fate of the earth and the taelons may be revealed when three astronauts from the future are discovered in stasis hidden in a government base.

In exchange for immunity, Sandoval agrees to testify against the taelons.

Liam and Renee suspect Zo'or of orchestrating a series of murders.

Renee is torn between love and duty when her boyfriend is captured by the Taelons.

The Taelons' decision to enter death stasis causes a rift between Zu'or and Da'an, who refuses to share the core energy he has accumulated. Meanwhile, Liam learns that he only has days to live.

After a Jaridian energy beam turns several Taelon companion protectors into assassins, Zo'or demands that they be turned over to him in 24 hours - or he will open fire on Earth. Da'an, meanwhile, dispatches Liam to take the assailants alive; and Sandoval becomes a pawn of the Jaridians.

The Taelons' fate - and possibly Liam's - is decided after Liam and Renee find Ma'el's regeneration chamber. The discovery of the secret location causes the surviving Taelons and Jaridians to seek the mechanism, which promises to restore their draining energy. Street, meanwhile, solves the riddle of Ma'el which will allow the Taelons and the Jaridians to join.