Ebb and Flo are invited to a fancy dress party. Granny's dressing up chest provides Flo's pirate costume while Ebb dresses in mud! Flo is not pleased and Ebb gets a wash. Ebb sulks and won't come to the party.  At the last minute, Ebb has to swim to the dinghy and Flo hauls Ebb aboard. She says, "Now Ebb is a proper Salty Sea Dog!" At the party they win First Prize for fancy dress.