The cadets have reached the end of the Hero Squad training. They have transformed themselves from rookies to real-life, life savers. It's now time to put all of the skills they've learnt so far to the ultimate test, in their final challenge - the ultimate rescue. Working with the Royal Navy, HM Coastguard and the RNLI, can they rescue two seriously injured surfers from the sea? Will all three agencies join together and get the casualties to hospital - before it's too late? Is this the end of their journey, or just the beginning for our six real life heroes?