Dr Chris and Dr Xand reveal how your skull protects your brain, and they are thrown in at the deep end when they find themselves running the reception desk of a busy GP surgery for Operation Takeover. Find out how to deal with a severe allergic reaction in First Aid, and there is a catch-up with Ouch patients Millie and Bolu. Meanwhile, over in accident and emergency, one patient has twisted their leg falling at a trampoline park, while another has diamonds stuck up his nose.