Earth: Final Conflict - Season 4 (2000)

The Taelons lend some of their dwindling core energy to Joshua Doors for a pilot cold fusion project, but the energy is stolen, leaving the Taelons vulnerable. Jonathan Doors lives on as an AI in cyberspace.

Augur is caught and placed in a special prison where he is placed in a sensory deprivation chamber. An amoralist gets him out and wants Augur to help him steal the gold Zo'or has on the mothership. When Liam learns of what happened he tries to find Augur.

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

The Taelons decide to leave Earth when it appears that the Jiridians are invading. Meanwhile, a group of Resistance prisoners saved from the mother ship include several disguised Jiridians who are causing trouble for Liam and Renee.

Renee's brother has PTSD. In a desperate effort to help him, she agrees to let him undergo special treatment. The treatment removes his emotion. The project is overseen by Sandoval and the emotion they take is given to Da'an.

While on board the mothership, Renee sustains an injury and while being treated, she gets pulled into the walls and disappears. Liam searches for her. While Zo'or believes that Renee's accident was not an accident and that someone on board is deliberately causing problems. Sandoval tries to find out who could be doing it. Both Liam and Sandoval discover that another protector who was believed dead is the one they're looking for.

Street asks Liam to help a friend who's arrested for the murder of a man he hated. Liam talks to him and he claims that he dreamed of killing him. Liam checks out the evidence and discovers that it's overwhelming. Liam discovers a device, which is of Taelon origin that can allow someone to get into a person dreams. Later Da'an is attacked and evidence implicates Sandoval. Liam offers to help him. He asks Sandoval where one can get the device and meets the seller, who remains anonymous. But they learn that the technology used is made by a woman Renee knows. But when ...

A CVI malfunctions and kills a soon-to-be father. The investigation leads Liam and Renee to a fertility clinic. Renee finds out she is infertile and suspects that Taelon technology is affecting worldwide fertility.

Da'an leaves and doesn't being Liam along. Zo'or is frantic as to why Da'an left. Liam wants to help but Zo'or doesn't trust him because he doesn't have a CVI, so Liam agrees to be implanted. But his CVI enables Zo'or to see and hear what Liam does. So he tells Renee. She tells Street who comes up with a plan to make double of Liam which doesn't have a CVI so with the double they try to find Da'an.

When the mother ship hits dark matter, the ship dos not begin to heal itself. Zo'or is left in an unconscious state and Sandoval takes control. He decides it is time to liberate the Earth from the Taelons.

The relic left by Ma'el is stolen from the mother ship. Zo'or threatens to destroy a major city if it isn't returned. Liam believes the final chapters contain information on synthesizing core energy.

Sandoval is watching via nanobots inside Street as she tries to decipher Ma'el's riddle. She tries to figure out how to escape from Sandoval and the Taelons forcing her to solve the riddle. She flashes back to childhood fears.

Liam and Renee learn of a facility where time travelers from the future are being held. They try to learn from them what happens to the Taelons. Sandoval's wife is used as a pawn to gain important information from him.

Sandoval goes to Renee to request a trial to testify to atrocities against humanity committed by the Taelons. A manhunt for Sandoval begins when he quits and leaves the mother ship. Liam has to protect him on his way to the grand jury.

Strange assaults and several deaths may be related to a Doors/Taelon joint venture where Taelon core energy was used to heal people. It appears that the energy is being sucked back out of the patients.

When Renee's boyfriend appears to her while he is imprisoned on the mother ship, Liam theorizes a special energy bond between the pair. Zo'or is upset by the human's betrayal and bans all humans from the mother ship.

The Taelons announce that they will all go into death stasis and wait on the mother ship for humans to discover how to create core energy and revive them. Zo'or and Da'an don't trust each other to be the last to submit to stasis.

Eight Taelons are killed when protectors' implants are re-calibrated with a new imperative to kill instead of protect Taelons. They fear the Jiridians have found a way to control the CVIs. Meanwhile, their core energy continues to deplete.

When Street solves the 8th dimension of Ma'el's riddle, a beacon leads Liam to a chamber with a healing pool. However, there is only enough in the healing pool to help 6 Taelons. Zo'or will do anything to insure his own life.