Roleplay series. Six children become Cadets at a hidden emergency response centre. A nuclear meltdown in Novistan poses a challenge to the cadets. Show more

Role-play series. Six children become cadets at a hidden emergency response centre. A volcano eruption on the Caribbean island of Montserrat takes the islanders by surprise. Show more

Roleplay series. Children become cadets at a hidden emergency response centre. A lightning strike disables the electric gates at Leeds Zoo, and wild animals roam the streets. Show more

Roleplay series. Children become cadets at a hidden emergency response centre. An astronaut has become dangerously ill on board the International Space Station. Show more

Roleplay series. Children become cadets at a hidden emergency response centre. A volcanic island in the Atlantic Ocean erupts, creating a mega-tsunami. Show more

Roleplay series. Children become cadets at a hidden emergency response centre. A series of devastating twisters threaten towns in the USA's Tornado Alley. Show more

Roleplay series. Children become cadets at a hidden emergency response centre. Two huge wildfires threaten homes and businesses in North Hollywood. Show more

Roleplay series. Children become cadets at a hidden emergency response centre. Two groups of climbers become lost up Britain's highest peak, Ben Nevis. Show more

Roleplay series. Six children become Cadets at a hidden emergency response centre. An earthquake in Chile challenges the cadets, who must decide which towns to evacuate. Show more

Iain tries to help a distressed ex-army friend and his wife, while Lofty's keen eye helps save a young man who must learn to stand up to his brother.

Lily and new doctor Ethan diagnose teacher Alice with a rare disease, while Zoe and Tess fight to save the life of Dixie's girlfriend.