Chairman Trevor Goodchild is usually seen as the villain of the series, although creator Peter Chung has occasionally said in interviews that the character is meant to be morally ambiguous.
He is usually depicted as a charismatic, narcissistic, perverted, cold hearted demagogue politician, sometime he's a hypocritical philosophical ruler or a calculating mad scientist of the technocratic authoritarian Bregna and as an opposite to the amoral "terrorist" anarchist Æon Flux of the free-spirited Monican people.
Goodchild's motives are left ambiguous; on many occasions he seems genuinely interested in improving the human condition, but at others he is only concerned with retaining or increasing his power.
While he is usually depicted as a complete autocrat, the episode "Thanatophobia" suggests that there are other individuals in the Breen government that Trevor must answer to, or at least give the impression of being accountable to.
He is shown at the forefront of armed operations on at least two occasions, as well as conducting other tasks such as performing medical checkups on patients wounded by his own fiendish security systems (a house call, no less).
Trevor is often frustrated by Æon's apparent lack of understanding of his own occasionally nebulous motives; he will be invariably heard to say "You just don't get it, do you?"
In the episode "Thanatophobia," Trevor mentions that he lets Æon sneak across the border and bomb a factory, thus allowing him to implant ever stricter security measures.
The pair's relationship reaches its apex in the series finale, "End Sinister", in which Æon pursues Trevor on a one-way trip 1,000 years into the future.
At one point, Trevor mentions that he lets Æon bomb a factory, implying that he uses her terrorist actions as justification for cracking down even harder on the populace.
In the end Æon decides (with difficulty) to remain loyal to herself (i.e., her copy) and not Trevor, allowing herself to be killed by the gun turrets of the Breen border containment system.
Following Æon's death, Trevor is seen to fall to his knees with tears streaming down his face, implying that there is more to him than the cold-hearted, calculating mad scientist.
Things get complicated, however, when Æon Flux inadvertently kills Rordy's lover and takes her place, unaware of her involvement in Trevor's scheme.
Trevor and his cohorts explore the jungle in search of an underground laboratory complex that Æon comes across, attempting to uncover experimentation involving a virus that causes human madness.
Trevor attempts to capture the exposed subjects such as Æon, a boy, and a baby that has grown into some sort of crawling beast that erases memories and induces sleep.
Æon undergoes continuously bizarre experiences/visions that involve a recurrent dream of a maze and the photograph of the baby girl she carries from the beginning of the episode.
Æon enters the cube with the girlfriend of the chief scientist working under Goodchild only to accidentally start a chain chemical reaction that eventually destroys the entire complex.
Trevor is implementing a system of "artificial conscience" for citizens of Bregna who appear to lack one of their own, by implanting a robotic entity called a "Custodian".
The effectiveness of Trevor's intelligence network is displayed, as he seems to know everything about the secret group, and ambushes and captures each of its members, including Æon.
Æon, after sealing herself away for centuries in suspended animation, finds that Bregna is now populated by these beings and that Trevor is still alive, attempting (in a rather ascetic manner) to emulate them.
Æon, not realizing that the creatures were actually humanity's further-evolved state, uses the aforementioned ray to destroy them, leaving only herself, Trevor, and a very few "alien" survivors.
Among the major changes is that he is shown to be in a power struggle with his brother (a character not featured in the TV series), and as part of the film's cloning-related plotline, it is revealed that Trevor is a seventh-generation clone created from DNA from the original Trevor Goodchild of the early 21st century, who had been married to a pre-clone version of Æon Flux.