Seasons one and two
The first two seasons of the series tell a single story—that of American office temp worker Todd Margaret (David Cross). After overhearing Todd recite jargon from a self-help CD and confusing it for his being on a call with a customer, ultra-aggressive executive Brent Wilts (Will Arnett) promotes Todd on the spot.
Todd is put in charge of Thunder Muscle, a new energy drink his company is seeking to sell in the United Kingdom. Todd's company has only one employee, an Englishman named Dave (Blake Harrison), who offers his full assistance in helping Todd promote and sell the product in Britain.
Most of the humor in season 1 and season 2 focuses on Todd Margaret's not being familiar with British culture and customs. His situation is compounded by the fact that Todd is a habitual liar, as well as by Dave's truly nasty pranks and manipulation of Todd.
In every episode of the first two seasons, Todd lies to cover up his ignorance and his lack of experience running a company. And Dave provides Todd with false information about British culture in order to constantly humiliate and sabotage him.
Todd has an infatuation with a local cafe owner Alice Bell (Sharon Horgan). Several of Todd's most damning lies are motivated by his desire to impress Alice and to manipulate her into a relationship with him.
During season 1, a cold open at the start of each episode depicts Todd before a British court as various charges against him are read out. A subplot involves Todd's supervisor Doug Whitney (Spike Jonze). Upset at having been fired by Brent, Doug learns that Brent Wilts is not really a company executive. Doug then investigates Brent for fraud.
For the bulk of season 1, Brent is shown as a foul-mouthed, abusive superior towards Todd, constantly demanding unrealistic results in terms of timetables for getting Thunder Muscle onto the British marketplace. Brent also demands that profits from the drink be delivered to him personally, so as to pay for his hookers and his gambling losses.
By the end of season 1, it is revealed that Brent is, in truth, a mild-mannered pushover like Todd, and that he has been promoted by the owner of his and Todd's company, a mysterious individual known as Mountford. Brent has been ordered by Mountford to promote Todd and to push him with unachievable expectations that Todd has no hope of meeting, thereby dooming Todd to failure.
Season 2 features Todd being reunited with his father, who offers to try to help his son avoid prison. Meanwhile, Alice, Brent, and Doug try to find out the truth about Mountford.
Todd gives Alice a fraudulent liquor license for her cafe in an attempt to buy her love, resulting in her cafe being shut down and a warrant put out on her arrest because of said fake liquor license. Alice investigates the situation and finds damning evidence that might free Todd and incriminate Dave. But she is killed when Todd unwittingly detonates a truck bomb while she is on her way to the court to reveal Dave's actions.
In the end, Brent attempts (and fails) to defend Todd in court as Doug discovers that Mountford is Dave, the son of a rich and powerful Lord. Several months prior, while visiting the U.S., Dave was at a bar, and a nervous Brent spilled drinks on him. Dave finds that his date at the bar has been stolen by Todd, who, exploiting Dave's brief absence to go get drinks, lured Dave's intoxicated date back to his home for sex. Humiliated and desiring revenge, Dave paid the bartender for information about the two men, then set about formulating a complicated revenge scheme to punish and humiliate both of them.
Todd is found guilty; but Dave's father, a high-ranking member of the House of Lords, arranges for the whole mess to get resolved, having grown tired both of the atrocious behavior of his son as well as of the scandal that Dave's and Todd's mishaps had caused England.
The elder Mountford arranges a pardon for Todd, on the condition that he leave England. Mountford, Sr. also reveals that Todd's American citizenship has been revoked on account of his actions, and the only countries that are willing to take him are the Turks and Caicos Islands and North Korea. Todd chooses North Korea due to his associating Turks and Caicos with the Turks who had been using him to plan a terrorist bombing.
When Todd arrives in North Korea, he is manipulated by the North Korean dictatorship to launch their first-ever nuclear weapon (a discussion at the launch control panel being the source of the cold openings for a second season). Todd pushes the button, bringing about a nuclear holocaust that seemingly destroys the rest of the world as well as all of the other characters, with the notable exception of the lone survivor, a Turkish terrorist who wanted to blow himself up in an act of terrorism during the course of the series—as he notes in the final line of the season, "There is a certain irony to [it]."
Season three
Season three of the series is a continuation that reframes the first two seasons as a dream due to the apocalyptic nature of the season two finale. David Cross returns, playing a new version of his character. Jack McBrayer joins the cast. [2]
Over the course of the third season, a radically different Todd Margaret (closer to the brash, abrasive Brent from the first two seasons) encounters different versions of characters from the earlier episodes, all while a prophecy of a "catalyst" destined to destroy the world is worshipped by a mysterious cult.
Gradually, the new Todd becomes aware of the events from previous seasons and tries to make changes to prevent his destiny to destroy the world with North Korean red button. These prove to be increasingly disastrous, resulting in Todd immediately throwing his trust to the new version of Alice (who is revealed to be a white supremacist in this reality) and alienating his new assistant Dave (who in this reality is completely innocent of any wrongdoings but forms a legitimate hatred for Todd).
It quickly becomes clear that every decision to prevent the end of the world is the poor decision and the universe itself conspires to force Todd to press the red button.
Finally Todd accepts the inevitable and presses the red button, only for the "North Korean army" to be part of an elaborate game show.
Reality immediately collapses and Todd awakens from a dream back in season one, implying that the vast majority of the three seasons were possibly a surreal nightmare or that Todd himself is permanently trapped in different versions of reality where he is doomed to failure.
