It's Mark's wedding day. He is torn about whether he should go through with it or not. Jeremy discourages him but Mark continues. On the way to the reception, Sophie breaks down and runs away. Jeremy comforts Mark as the 'El Dude Brothers' are reunited.

Jeremy takes Mark on a stag weekend, with a rented canal boat. There, they meet two sisters, Aurora and Lucy, and their father. Jeremy falls in love with Aurora, whilst Lucy becomes sexually attracted to Mark. The father offers Mark a job in India, a way out of his impending marriage to Sophie, whilst Jeremy accidentally kills, and then eats a bit of Aurora's dog.

Mark has invited his parents over for Christmas dinner. Everything has been planned down to the last detail but Jeremy has become over excited and Dobby and Super Hans show up as unexpected guests.

Jeremy's love life takes a surprising turn, as Mark is dealing with his own matters of the heart.

Mark continues to dread the impending doom of his wedding day, still questioning his actions from the previous season. Both Mark and Jeremy meet Sophie's parents and brother- leading to disaster with arson, sex with a parent and drunken arguments.

Jeremy plans to throw a secret magic mushroom party in the flat, where he hopes to seduce his ex, Big Suze. But when Mark suddenly comes home from work with gastric flu, Jeremy's plans go to pieces.

Can you love two people at the same time? Jeremy believes you can, and his gorgeous new American girlfriend puts his taboo bashing beliefs to the test. Mark believes you can only love one person. Besides, he and Sophie, the object of his unrequited love, are getting on really well, especially since he starting hacking into her emails.

Mark, determined to forget Sophie, makes an effort to go out with April - but manages to blur the line between enthusiastic new boyfriend and stalker. Jeremy joins a new band, Executioners Bong, but insists that he is neither a roadie nor the equivalent of Bez.

Mark worries he and Sophie are drifting apart and proposes. Elsewhere Super-Hans decides to give up drugs, and Jeremy once again gets intimate with past love Big Suze.

Mark makes a final play for Dobby, the object of his desires. Meanwhile, Jeremy meets a new love, Russian émigré Elena. Both guys are determined to impress, but one of them is an expectant father. And when the pregnant Sophie spills the beans, both Mark and Jeremy's worlds change forever.

Mark's baby's christening day arrives and he arranges to take Jeremy to the church with him. The duo end up getting locked in the hallway of Zahra's flat though.

Jeremy meets his hero, techno musician Russell "The Orgazoid". He ends up working as his handyman, which leads Mark to become suspicious, as it seems that Jeremy's job consists of making smoothies for him. Meanwhile Mark meets Sally at his school reunion, one the few girls who actually ever liked him. It turns out that she has married one of Mark's childhood tormentors, Foz. Mark decides to try and seduce Sally whilst Sophie is away on a business trip.

As a last desperate hurrah before the baby arrives, Mark and Jeremy decide to throw a party. Mark sees it as his final opportunity to reignite his relationship with Dobby, while Jeremy imagines it's a chance to make Elena insanely jealous. But as the evening proceeds, it all becomes a bit of an emotional roller-coaster.

Mark and Sophie return to work, while Jeremy renews his acquaintance with the depraved Super Hans, in yet another filthy, funny episode.

It's the last ever Peep Show from the El Dude Brothers. Jeremy is turning 40 - and it's hitting him hard - while Mark makes an audacious attempt to win the woman of his dreams.

Jeremy is hired by an old school friend to make a soundtrack for a film he's making. Mark makes a new friend at work who turns out to hold a fair amount of prejudice. Meanwhile, Sophie spends time with Jeff.

Mark gets into online gaming and live role play with Dobby and wonders whether she may be The One. Meanwhile, Mark and Sophie finally sort out their annulment. Jeremy joins a cult.

Time is running out for Jeremy as Elena and Gail's marriage is imminent. However, he thinks there may be a way to get Gail off the scene and win Elena back. Meanwhile Mark, although conflicted about becoming a father, is worried that Jeff is becoming a potential rival dad. He decides that he's going to learn to drive so that he can take Sophie to the hospital when the baby arrives. Sophie is delighted, but learning to drive doesn't prove that easy.

Mark and Jeremy go to a party to try and find some long lost love, or perhaps someone for the night. At the party Mark meets a cool goth 'teenager' named Valarie, who wants to take their acquaintance to the next level: bowling! This gives Jeremy a chance to hook up with Toni, and allows Mark to take his mind off of Sophie . . . or will it?

Jeremy and Nancy are getting married, for visa reasons. Mark, determined to save his friend, will do whatever it takes to stop them...

Jeremy gets called for jury service but soon complicates things by falling for the defendant. Elsewhere, Mark & Sophie go clubbing.

Johnson returns, immediately taking a shine to Big Suze, proposing a deal involving her to Jeremy. Mark is caught up in Johnson's "Project Zeus" with his reputation at the workplace hanging in the balance. Geoff makes his first appearance of the season, and Sophie spends some alone time with Jeremy in the hotel room.

In order to avoid spending time with Sophie, Mark gets a gym membership. Whilst there he discovers that Jeremy's ex-wife Nancy is working there. Mark tells Jeremy who then becomes desperate to get back together with her. He decides to take a job as a cleaner at the gym and sets about stopping her from dating Mark's personal trainer Matt.

Jeremy's tortured relationship with his very sweet mother comes under the spotlight. It emerges that Jez has been living off handouts from his mum for years and now he's in line for half of her £40,000 bequest from an aunt. Jeremy's need to self destruct kicks in immediately, as does Mark's inability to stop his excruciating attempts to ingratiate himself with any mature grown-up. He adores Jeremy's mum and hero-worships her Scots Guardsman boyfriend.

Jeremy holds a book group at the flat in an effort to try and impress Zahra but apart from Mr Nice, Jeremy has never read a book. Mark is concerned by not being able to satisfy Dobby's sexual needs and decides to get some help for the problem.