Gary and Terri have a huge row at the gym when Terri reveals that she's asked Kay to replace Chloe as wedding planner. Gary, it's fair to say, doesn't think Kay is up to the job, and the huge row that erupts means that by next morning, Gary and Terri still aren't talking. In fact, Terri has gone "fully dark"...

Gary has more than just the row to contend with - he chairs a meeting of Butterchurn Crescent residents in an attempt to deal with growing unrest about Aaron and his disruptive, noisy, partying ways. The neighbours want Gary, as crescent warden, to do something about Aaron - Big Gary is keen to smash his car up and scare him out of the crescent, which is surely a terrible idea - and Gary is starting to feel the pressure.

Terri, Kay and Alison have a pre wedding lunch in the West End, while Gary and his groomsmen have their suit fitting. Neither event goes all that well - Terri has gone past the point of no return with the "fully dark" and Gary is feeling even more pressure as neither his friends nor his family seem able to behave themselves at the posh tailors.

When Gary gets home, Aaron is having yet another party next door, and makes a fool of Gary when he spots him spying on the party from his bedroom window. Gary is in a right state, but still can't get hold of Terri to help him. A visit from Winkle makes matters worse - he reveals he's started dating Terri's mum, Jodie Simone, and wants Gary to treat him as family, which doesn't go down well. Just as this is going on, Aaron's party spills out onto the crescent. Gary confronts Aaron and his friends and begs them not to bring their after party back to the crescent, but to no avail - Gary is a laughing stock. And finally he breaks ...

Gary enlists Stuart's help and seems hell bent on smashing up Aaron's car to teach him a lesson. But before he can, he succumbs to a panic attack. When he comes round later on the sofa, Terri is home, his parents have rushed round, full of sympathy and understanding, as ever - and then the doorbell rings...

... it's Aaron. Someone has smashed up his car. But not just that - his cat's been stolen as well. Gary seizes the moment and claims he was responsible, and tells Aaron he'll send his cat back to him on the condition he packs up and gets out of the crescent. Aaron, beaten, retreats. Gary, assuming big Gary and Winkle were responsible, congratulates his dad on a job well done. Only Big Gary doesn't know anything about this cat...