Colin and Zoe are preparing their wedding day. Bayleaf goes to Spain and yells at the lazy, sunbathing private eye to help him find Melanie. Two crooks fiddle with some electric gadgets in a hotel room, causing a huge explosion and a big crash on the street. Colin finds the remains of the electric gear in the hotel room and takes them outside. Meanwhile Sicknote realizes that the walls start crumbling and shouts at everyone to quickly leave the hotel. A helpful policeman tells Colin that he is in fact holding a bomb and orders him to stand very still. Colin is scared stiff and shaking too much to put the bomb down safely. Nick has to help him. An expert later explains that the bomb wasn't sharp yet and nothing could have happened, so Colin wet himself for nothing. Bayleaf finally sees Melanie, who's being used as a servant girl in a cafe. She manages to steal away and he tells her to quickly fetch her passport and return. They manage to escape and he takes her home to England.

Colin refuses to tell the others where he and Zoe plan to spend their wedding night to avoid having a prank played on them. On his stag night, Sicknote tries his skills at Karaoke. Kate meanwhile decides to give Ian a chance despite losing his baby and invites him to Colin's wedding. The lads tie a totally drunk Colin to a lamp post in the pouring rain until he tells them the hotel's name. Zoe makes a wonderful appearance at the church in an ancient fire engine, while Blue Watch have donned their parade uniforms. The wedding is only disturbed by the loud wailing of Colin's Mom. When Zoe throws the bridal bouquet Ian catches it, making Kate blush. George, Recall, Sicknote and Kevin come to the Clarendon hotel, asking for the Parrish's. But only a couple named Smith have booked in for the night. Suspecting a fake name, the guys barge into the hotel room with a lot of noise, scaring the living daylights out of the poor couple in the room - who are strangers indeed. Colin and Zoe are meanwhile enjoying an undisturbed wedding night at the Tower Thistle hotel. During the next duty, Nick hands over a postcard from Colin, explaining the hoax. The series ends with a threat of Blackwall being closed and Hallam making a passionate speech to save the fire station.