Mysterious firefighter Jack Morgan joins the watch, Sicknote isn't looking forward to receiving his 20 years service medal, a man is seen leaping from a burning house and a car crashes into a restaurant.
Nick is unsympathetic to Alexis's pleas to help him escape prosecution after the restaurant fire and a failed robbery results in the guards being trapped in a burning security van.
Nick heads to Cyprus to see his son after learning Costas and Evgenia are experiencing problems. Meanwhile, back at Blackwall, an explosion at a swimming pool sees a man trapped as the building floods - meaning Jack has to make a brave rescue.
Recall is finding living with Billy to be frustrating, Sandra learns about Hallam's affair and a fire starts at a warehouse where a music video is being filmed.
At the warehouse shout a gantry collapses and sees Hallam plunge 80ft into the basement. Unconscious but still alive, he is rushed to hospital with Recall who has also been injured in the shout.
The watch are in shock after Hallam's death as they prepare for his funeral. Pearce has taken it particularly badly and starts to contemplate a transfer away.
Jack retaliates after Pitbull goads him, there's another hoax at the hospital but a bit of detective work finally identifies the culprit and the watch have to rescue a wheelchair-bound man from a house fire.
New Sub Officer Carole Webb arrives and Pearce is unimpressed, Billy receives unwanted female attention when he rescues women trapped in a Turkish bath and a gang of youths start a fire that sees Jack and Recall get trapped.
Nick is at a conference where he is taken by a Dutch firefighter, Carole is left in charge resulting in her and Pearce arguing after a mixup at a shout and new firefighter Chris Newman - promptly nicknamed Skippy - joins the watch.
A cycle courier is glued to his bike and rides into the station for assistance, Skippy talks down a suicidal woman and after a performance of MacBeth in a prison Sicknote and Jean get a nasty surprise.
The watch have to free a taxi driver whose arm has been trapped in a public toilet, Pearce is concerned when his dog Bruno goes missing and Pitbull appoints a reluctant Recall to represent him at his disciplinary hearing.
Dutch firefighter Marianne joins the watch on exchange, a thief becomes trapped under a forklift and Recall's defence sees Pitbull get only a slap on the wrist at his disciplinary hearing.
Nick summons up the courage to ask Marianne out, Billy follows Lauren and gets beaten up by her pimp, Pearce goes for an interview with another brigade and a woman is trapped after a fire at a fairground.
Beattie and Kelly get trapped in a fire at George's gym. George is shocked when the Fire Investigation Unit tell him it looks to be arson. A plaque in tribute to John Hallam is unveiled.