Dippy is really excited when he's invited to sleep at Spike Triceratops' house on Friday. They'll watch Scarysaurs Go Wild and eat popfern and...but there's one problem - Dippy wets the bed. "Lots of podlets wet the bed," Mrs Diplodocus reassures him. But Dippy doesn't want Spike to find out so he tries all sorts of things to be dry by Friday - going to the toilet just before turning out the light, not having a drink of water before going to sleep - but each night poor Dippy still has watery dreams. Can he be dry by Friday?