THREESOME is a comedy about three inseparable friends on the verge of 30. Alice lives with her boyfriend Mitch and their gay best friend Richie. Together they form three points of an unlikely triangle, living, laughing and larging it together. Until one particularly big night out threatens to change their lives, forever.

And now our threesome have to figure out how to explain their unusually triangular relationship to the world. And most crucially to Alice's domineering and not entirely nice mother Lorraine (who is not fond of Mitch but adores Richie). Alice takes Lorraine off to dinner to break the bad news; she's marrying Mitch. But how to explain the threeway daddy-mummy-daddy set up? Meanwhile, Mitch and Richie (having all jointly sworn off drink and drugs in solidarity with Alice) stumble across a stash of drink and drugs. Will they be strong enough to resist temptation whilst also assembling all the new nursery flat-pack? Or is it just an immutable fact of life that flat-pack is far more easily assembled on drugs?

Alice, Mitch and Richie attend their first antenatal class. To everyones surprise Alice and Richie are hopeless and Mitch is an amazing proto-father. Alice and Richie go into panic mode about their suitability as future parents, and so Mitch entrusts them with a robot baby from the antenatal class to practice on. All they have to do is feed it, rock it, change it and not totally destroy it. Which unfortunately is exactly what happens. Richie also meets or rather pulls a genuinely amazing man, Dave The Builder. Richie likes him, but only to a point he is not grown-up enough to have a grown-up relationship. Can Mitch persuade Richie that maybe it's time to give love a chance?

Mitch still hasn't got a job, and now his lack of funds is starting to become a problem. Alice needs reliable support more than anything right now the full reality of what's about to pop out of her in six months time is starting to hit home, and with the impending 12 Week Scan they're actually going to get to see their baby for the first time. It's time for Mitch to step up to the plate. Unfortunately for Mitch, he spectacularly fails to do so. Which is when Ben turns up. Ben is tall, handsome, rich, charming, successful and Alice's ex from four and a half years ago. Back in the day, Alice dumped Ben then started dating Mitch, and when Mitch actually meets the man who he replaced his insecurity starts going into overload. Ben is everything a woman could want in a man but surely when it comes down to it, Alice will always chose her Mitch?

To Alice's amazement Richie and Dave are now dating! Proper boyfriends and everything. With Richie's birthday approaching a day of fun, fun, fun is being planned. But when Dave reveals he has alternative plans for Richie, tensions arise between the friends as Alice and Mitch conspire to keep Richie to themselves. When plans backfire, Richie ends up leaving Alice and Mitch to spend the day with Dave, who unveils his own birthday surprise; a trip to Paris. But that means Richie leaving Alice and Mitch on the night they've planned so hard for so long to make special. Who is Richie going to chose? When Alice suffers some unexpected complications with the pregnancy, all disagreements are forgotten as everyone races to the hospital to be by her side. Alice's condition quickly settles, and for the first time our heroes get to find out the gender of their baby. And Richie has to make a very painful choice.

The mothers are coming! All the mothers; Mitch, Richie's and Alice's, all together, all for the first time. Alice, just a month from popping, has decided to throw a baby-shower, and so Lorraine (Alice's mum), Sue (Mitch's mum) and Jenny (Richie's mum) converge on the flat to deluge her with presents and attention. Alice in turn has taken to baking, not-swearing and dressing like a proper woman. Mitch and Richie are horrified. Mitch and Richie escape for the evening to a local bar, and run into Wendy; a ballsy, feisty, fabulous girl who reminds them very much of a pre-pregnancy Alice. Spending time with Wendy is wonderful, but it's like cheating on Alice. Mitch and Richie vow to call off the "affair", but when Lullaby Princess Dreamtime has a nauseating baby shower a gift arrives in the flat, the combination of that, Alice and The Mothers are more than Mitch and Richie can bear. How long can they hold out before they're drawn back into Wendy's arms, and how will Alice react when the two women finally meet?