The Magic Cutlass by Giles Andreae

During the school play, Flinn finds himself slap-bang on the deck of a real-live pirate ship . . . and he’s not alone! Pirate Diplodocus, Pirate Triceratops, Pirate Stegosaurus and, of course, his old arch-enemy, Captain T. Rex, are all there too. They are all on the hunt for the famous magic cutlass that can grant wishes – WATCH OUT, CAPTAIN FLINN! But you have to be careful what you wish for, and that dastardly Captain T. Rex soon finds himself in more trouble than ever!