At the UK company Reynholm Industries, their corporate high-rise towers are full of beautiful happy people with one success story after another. Well, except for the employees that work in the basement - the IT department. While their colleagues work in fantastic surroundings, Jen, Roy and Moss must work below ground in the dark and horrible basement, struggling to make it into normal society.
The IT Crowd is a playful and somewhat surreal look at what it's really like to be the underclass of every company - the IT Department.
Dashing Philip drops in from the sixth floor to ask Jen to the theatre, but a possible date turns into a work outing when Moss and Roy also get invites. The evening predictably spirals towards disaster, leaving Jen to wonder whether Philip is who he claims to be.
Denholm is informed of a police presence at the office, causing him to commit suicide. Roy asks Moss to "pimp" the vibrate setting on his mobile phone because it is so weak, and then is mortified to find an internet site that predicts his date of death to be 3pm on the date of Denholm's funeral. Despite reassurances from Moss and Jen, he cannot help but worry. Denholm's successor then reveals he despises the IT department and would love to see them fired. At the funeral, Roy causes a scene as his mobile phone vibrates heavily, believing he is dying. Denolm's successor threatens to fire Moss, Roy and Jen, but Denholm's estranged son and natural successor to Reynholm Industries, Douglas (Played by Matt Berry), bursts into the funeral and takes over the company. It turns out that he loves the IT department, and their jobs are saved. Jen takes up smoking again after watching Denholm advertise them on his funeral video.
Worried that his life is stagnating, Moss enrols on a German cookery course. Jen discovers that the only place in the building where she can now enjoy a cigarette is a smoking area not unlike Soviet Russia.
Jen has found love, and is giving a dinner party with her new boyfriend to six of their single friends. But when the three male invitees drop out at the last moment, Jen is forced to call upon Moss, Roy and Richmond.
When Jen loses concentration during a board meeting due to a faulty bra, Moss overcomes his fear of ladies' underwear and plots a way out of Reynholm Industries by inventing a flawless bra.