Mickey and Nipper help the survivors of a bus crash. Mickey is determined to prove the bus driver is not at fault and Nipper decides to foster a boy orphaned in the crash.

A natural gas explosion leaves three people trapped two stories under ground. The squad tries to provide rescue but with time running out, a second gas explosion traps them as well. With a rapidly diminishing air supply and cyanide gas leaking into the cellar, Mickey, unwilling to abandon the trapped workers, disobeys an order from Inspector Adams to leave the scene.

Angel tries to help his friend, a towie, who is suspected of taking money from a bookmaker after he's involved in an accident. Angel rescues a young girl after a fall at an oil depot.

Georgia tries to help the daughter of an old friend deal with her brother's death. Angel learns more about his father after his death.

There has been an explosion on a ship and several men are trapped. The job of rescuing the injured crewmen is made more difficult when the squad finds evidence of a bomb and find themselves hampered by the threat of additional explosions and a man who is not what he seems.