Lorsqu'elle arrive à l'hôpital après avoir dû passer la nuit dans sa voiture, le docteur Caroline Todd, nouveau chirurgien, est un peu déboussolée par le caractère pour lemoins déroutant de ses collègues.

Mangan, Pipa Haywood, Mark Heap, Michelle Gomez... Dans cet hôpital, pas question de s'occuper des patients... Des médecins aux agents administratifs, tous sont également préoccupés par leur seule petite personne

Joanna est préoccupée par son âge et par sa relation avec Statham. Mac , lui, apprend que son ex-fiancée est enceinte. Pendant ce temps, Caroline cherche une locataire, mais Angela n'est certainement pas la bienvenue.

Mac tente de reprendre sa vie en main: une nouvelle petite amie, un nouveau travail... Mais ou cela peut-il l'emmener?

Caroline décide de pendre sa crémaillère, et il semble que tout l'hôpital y soit présent. Au cours des préparatifs, Martin laisse Sue faire toutes les courses. Caroline se questionne: qui va- t-elle essayer d'embrasser ?

Aujourd'hui, tout le monde est stressé. Harriet et Joanna pensent toutes les deux être enceintes, et malheureusement pour Harriet, ce n'est pas la première fois. Martin passe ses examens et a peur d'échouer. Pendant ce temps, Mac passe un entretien d'embauche qui ne se déroule pas comme il l'aurait souhaité.

Les examens de Martin sont enfin terminés, et c'est désormais le moment de vérité. Il vient de recevoir la lettre contenant les résultats, mais il est tellement terrifié qu'il ne peut l'ouvrir. Boyce trouve une solution : il le paiera à condition que Martin ouvre la lettre...

Mac tente de se remettre sur le droit chemin. Il s'est trouvé un nouveau travail chez Sheffield et une nouvelle petite amie. A l'hôpital, la nuit est très agitée...

Caroline ne peut toujours pas croire que Mac va partir pour Sheffield. Et toutes ses tentatives pour l'en dissuader sont vaines... Quant à Sue, elle serait capable de tuer pour que Marc reste à Green Wing !

It's eight weeks since Guy stole the ambulance and drove to a literal cliffhanger ending with Mac and Martin in tow. Mac is now in a coma and is receiving a constant stream of admiring visitors while Guy is not coping too well with the fact that he's slept with his mother. She's not having a great time of it either with her office staff's constant ribbing. However, Martin is happy to have a new brother and he's now gone as far as kissing Karen's tongue!

Statham, when not drawing breasts upon his x-rays, is trying to make Joanna jealous with increasingly desperate pretend sexual exploits. Mac is back at work and, with no help from Guy, is causing Caroline grief as he can't remember the twenty minutes that they were an item. Meanwhile, Karen and Martin have moved on to the next level and she's wearing him out.

A documentary crew visits the hospital, exciting the creative juices in Alan and the bitter rivalry between Sue and Joanna. Meanwhile, a tape of Guy being "intimate" with his mother is now in the possession of Sue who plays merry havoc with his and Joanna's life. And is this the end for Angela as she falls for the charms of the director who's off to Toronto next week?

Guy's got problems, he's looking for a place to stay while fulfilling his community service. Martin is in need of some cash so acts as a life model at an art class attended by the soon-to-be-gobsmacked Sue. Statham is distraught at his parking space while Joanna might need glasses. Mac and Caroline's relationship is hotting up but could all that change as his ex-girlfriend joins the staff?

Dr. Statham enters politics but requires a voice coach and the use of a car with two loudhailers! Martin inadvertently becomes a pimp. Mac and Caroline get a little closer but Holly sticks her oar in with a little ginger surprise for Mac. Harriet and Lyndon manage to have a date despite Joanna's best attempts to sidetrack her with work. Guy is not exactly the best flatmate but is he there at the right time for Caroline?

Mac adjusts to his new rôle as a father while Caroline tries to make him jealous with Guy. Statham is rather pleased with himself for winning his radiologist's community weekly caption competition which does not please Joanna. She employs her vertically-challenged cousin to scare him but a trip to the incinerator is soon required. Martin pesters Joanna for knowledge of his dad and hires a detective to find him.

Sue does some detecting; Martin comes into some money; Statham and Joanna try to keep the incident with the stuffed heron secret; Caroline has to be cruel to be kind.

Demented dwarf killers Joanna and Dr Statham are amazed that they seem to have got away with their hideous crime so consider themselves above the law. Caroline gets no fewer than three proposals. Sue gives birth to an infant with a mane just as impressive as Mac's. Mac gets some bad news while Martin (and we the viewer) ends up with a strange sense of déjà vu in the season's cliff-hanger ending.

Caroline engaged to Guy, Mac getting closer to death, Statham and Joanna on the run, Karen acting strange and the admin girls letting their hair down a bit lower than normal.