Luke has a 25th birthday party, but his mind is elsewhere having met with his estranged father. While dad Rob is eager to make up for lost time, Luke is unsure whether he wants to get to know him. Meanwhile, Stella and Sean step into the boxing ring, where a practical joke leads to a close shave when Sean receives a killer blow.
Stella and Sean are preparing for their new arrival, while Emma is settling into married life with Sunil. But domestic bliss looks like being short-lived for both mother and daughter when Rob's business dealings bring him back to Pontyberry and Sunil enrols at medical school - and soon takes to the boozy student life. Meanwhile, Dai begins working at the funeral home with wife Paula, causing untold problems for the couple.
Sean plans to leave Pontyberry after Stella's confession that he might not be the father of her baby, and it isn't long before the gossips get wind of this latest development. But some familiar faces are back - Luke is home from Canada, having been deported for hiding his criminal record, and Bobby has also returned - and just in the nick of time for Paula, who has reached the end of her tether with Dai.
After back-to-back bombshells from the doctor and Sean, Stella feels as if her life is officially over, so Aunty Brenda gets her a job at the Bap Factory, hoping she will be able to bake away the blues. But her first day takes an unsavoury turn. Twinkle-toed astrologer Russell Grant is in town to open Karl and Nadine's salon, Dai and Paula continue to have problems in the bedroom and Emma fights for her man at Sunil's student ball.
Emma and Sunil kiss and make up, but if Leah has anything to do with it the young couple may not be playing happy families for long. Dai's hopes of a quick marital fix also look bleak when Paula considers turning her night away from home into a permanent arrangement, and Alan is heartbroken to discover the rugby club is closing down. Luckily for the troubled residents of Pontyberry, help is at hand in the shape of Dutch life coach Peschman , who has some wise words of guidance and a unique form of therapy.
Ashley Banjo brings Got to Dance to the valleys, so Ben persuades Little Alan to enter, hoping he can win the fame and fortune needed to save the rugby club from closure. The only problem is, the would-be star has two left feet. Can Bobby's choreography do the trick? Stella attends her fancy-dress school reunion, where she takes a liking to Rob in his Tom Cruise costume, while hopes of a reconciliation between Paula and Dai look bleak after a scandalous confession.
After the disastrous school reunion, Stella tries to forget her drunken misdemeanours and keep out of trouble by working at the undertakers, but there's nowhere to hide when she accidentally interrupts what appears to be a romantic date between Rob and Melissa. Alan has a nasty run-in with his ex-wife too, having learnt the rugby club is falling into the hands of a property development company. Never defeated, he's planning a counter-attack, albeit an ambitious one. Elsewhere, Paula and Dai's bumpy break-up takes an unexpected turn with the unhappy couple swapping traits - while Dai develops an unhealthy attachment to booze, his wife samples life as a sober singleton. (Mis)Guided by Peschman's spiritual teaching, Paula aspires to be a more generous person and offers to babysit Emma's son, only to fall off the wagon - well, the bus - and lose little Abrha on the way to his naming ceremony. Without the baby, there might not be much of a bash, but Jagadeesh's rendition of It's Not Unusual, plus the unexpected arrival of Luke's new foe, Lenny, really kick off the party.
Paula, on the other hand, doesn't believe in suffering in silence like her estranged partner, and instead expresses her feelings at the long-awaited Got to Dance auditions, giving judge and guest star Ashley Banjo a show he'll never forget. Bobby's first solo funeral also turns into a fiasco when two parties arrive at the cemetery to find only one plot, causing the funeral director to take unusual action to resolve the, ahem, grave situation. There's a rumble elsewhere in the valleys as Luke butts heads - and fists - with Lenny in the amateur boxing championship. Meanwhile, Big Alan's 'Save Our Pitch' campaign scores a vital try towards victory as Rob quibbles the morals of his property development project. Melissa, though, is willing to use any means necessary to ensure her silent partner stays schtum about his doubts.
Fight night arrives in Pontyberry and, while Lenny is prepared to play dirty, Luke is indifferent about the impending clash and more concerned about inning over Zoe. Stella isn't enthusiastic about Luke's boxing career, either, and confronts Rob for wrongfully encouraging their son, but the debate only reignites sparks between the old lovers. Alan remortgages his house in an effort to raise funds for the rugby club, although the valiant gesture could work against him if Melissa follows through on her threat to apply for sole custody of Little Alan. Paula also resorts to desperate measures to get Dai back, while Leah cries wolf to Jagadeesh about an 'affair' with Sunil. Amid the chaos, Ben bravely asks his beloved Bethan out on a date, however her answer leaves him flummoxed.
Wonders never cease in Pontyberry in the penultimate episode of the series as unlucky-in-everything Alan becomes the local Casanova. His previously untapped luck with the ladies comes in handy when his re-mortgage application gets rejected, teaming up with Aunty Brenda to raise funds for the rugby club. The pair organise a charity match and even manage to bag former Welsh international player Scott Quinnell to coach the locals. Off the pitch, Rob and Stella try to rebuild their trust in one another, but the promising reunion is cut short by the surprise return of Sean, who has some eye-opening news. While Nadine and Karl plan to expand their family, Stella's is bursting at the seams once Zoe moves in, with Lenny continuing to pester the brood. It all kicks off on game day as Emma's pent-up anger with Sunil finally explodes, and Alan reveals the identity of Melissa's 'silent business partner'.
Just when you thought Stella's house couldn't possibly get more crowded, Michael decides to base the office for his go-it-alone solicitors' firm there.
Stella is worried about Michael, who seems to be inching towards a mid-life crisis after splashing out on a motorbike and leathers.
Trouble looms for Stella and Michael when the latter makes a monumental mistake. Big Alan, meanwhile meets his match, and Dai organises a poker game.
After being fired from the café by Little Alan, Michael heads to the pub to drown his sorrows, and bumps into flirty client Beyonce.
Having given Michael the cold-shoulder treatment for a couple of days, Stella is ready to thaw and make amends - until she uncovers yet more secrets and lies. Luke's gambling problem looks set to spiral when he accepts cash from a stranger, while Dai Davies decides to run for the local council and hits the campaign trail - with Aunty Brenda as his spin doctor
Stella finds it hard to move on from Michael and Celia receives a blast from the past. Aunty Brenda's political campaign runs into problems.
Stella is pleased after sister-in-law and best friend Paula makes a surprise return to Pontyberry. Big Alan is concerned about Celia and ex-husband Dan.
It is election day and Aunty Brenda can taste victory until a slimy new rival decides to enter the race. Ben and Lily go on a disastrous date.
Arrangements for Alan and Celia's wedding are in full flow as friends and family come together for their stag and hen dos. Zoe learns about Luke's debts.
Big Alan and Celia nail their fancy dress theme as they tie the knot in front of their nearest and dearest. Guest appearance by Gino D'Acampo as himself.
Beyonce's pregnancy causes tension between Stella and Michael.
As Stella and Michael try to get their relationship back on track, BeyoncÉ starts making outrageous demands. Meanwhile, Karl and Nadine take up dancing.
It's Stella who gets the shock when she heads to London to surprise Michael. Back in Pontyberry, Jag's mother Nina shows up and drops a bombshell.
Michael begins to suspect Stella and Rob are hiding something. Plus, Aunty Brenda vies to become mayoress of Pontyberry and Luke hatches a life-changing plan.
Michael tries to make it up to Stella after he discovers Rob's secret. Aunty Brenda gets a blast from her hippy past and things heat up between Ivan and Nadine.
The early arrival of Michael and BeyoncÉ's baby throws Michael and Stella's lives into turmoil. Over at the Frisky Fox, Nina discovers Carole and Jag's secret.
It's a sad day in Ponteberry as Paula returns home for Daddy's funeral. But those who turn out to pay their respects get a huge treat when Robert Plant shows up.
Michael decides it's time to choose between his son and career. Following their recent shenanigans, Stella tries to confront Rob. But can she find him?
Stella is left with a heart-breaking decision after she and Rob finally get the chance to talk. Plus, Beyonce drops a bombshell on Michael.
It's a big day for Stella and Michael and the family all turn out to celebrate. Also, Rob undergoes life-saving surgery and Nadine battles with a huge decision.
Stella is faced with a tough decision when Michael is offered a job in Dubai. Luke discovers a long-kept secret that's about to change everything.
Stella's in turmoil knowing she must confess her secret to Michael. Luke and Zoe get some life-changing news and Aunty Brenda makes a shocking discovery.
Michael delivers some shocking news, Beyonce shows up at Stella's and things get too much for Aunty Brenda.
A nasty surprise leaves Stella fighting to save her and Michael's relationship, while Luke bumps into a stranger from Rob's past.
The day of Stella's graduation day arrives, but despite three years of hard graft she is not in the mood to celebrate as the divide between her and Michael has grown even bigger - and the return of an old friend isn't going to help much either. Meanwhile, Aunty Brenda is borderline hysterical when she arranges to meet her real father, and love is in the air for Nadine. Last-ever episode of the comedy drama, starring Ruth Jones. Last in the series
Head back to Pontyberry for this insightful glimpse into the making of series four.