Dr Chris and Dr Xand reveal how your skull protects your brain, and they're 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 we catch up with Ouch patients Millie and Bolu. Meanwhile over in Accident and Emergency, one patient has twisted their leg falling as a trampoline park, and another has diamonds stuck up his nose.