When a spell accidentally goes wrong, Ben and Holly grow to human size! Now they can play with Lucy and her friends and want to stay big forever! The duo befriends a caterpillar called Betty, who wishes she could fly, and King Thistle advises them to fatten her up. They soon get a big surprise the next day!

Nanny Plum takes the Fairy children for a Nature Class in the woods and bumps into the Wise Old Elf, who is teaching a Nature Class to the Elf children. Holly invites Ben to the annual royal fairy picnic. King Thistle hopes there it won't be a repeat of last year's magical jelly flood. Snooty King and Queen Marigold invite themselves round for dinner at King and Queen Thistle's Castle to sample Nanny Plum's cooking. Nanny; the best cook in the world, tries hard to cook special modern food. Part 2 of the First Christmas Special) The elf airplane makes an emergency crash-landing en route to delivering the last batch of Christmas presents. Ben, Holly, Nanny Plum, and Mr. Elf set sail to retrieve Redbeard the Elf Pirate's sunken ship treasure with the Elf Submarine, but Big Bad Barry tries to prevent them.

Mr. Elf has built a new boat to replace the one Big Bad Barry ate. So Mr. Elf is very nervous when the king commands him to take them all on a cruise to a tropical paradise. Will Big Bad Barry strike again? Holly accidentally smashes the Queen's new teapot, and Ben tries to help her repair it, but it doesn't work.

Holly needs her wand to do magic. But one day, Holly loses her wand and is very sad. Ben uses his elf skills to find it again. Mrs. Fig's magic school has been crashed by a falling apple. A cake stall is arranged to pay for the repairs, but no one can eat Queen Thistle's cakes. Naughty Daisy and Poppy magic their teacher, Mrs. Fotheringill, to the centre of the Earth. Granpapa Thistle leads Ben and Holly on a dangerous mission through dinosaurs and volcanoes to find the missing teacher. They say that at the end of every rainbow is a pot of gold. So rainbows are a pirate's best friend - if you're looking for treasure. But, if like Captain Squid, you are hiding treasure. Rainbows are a pirate's worst enemy! It is the time of the year for the blue moon which gives no fairy magic for one day of the year and also stops the Elf Factory's "Great Elf Engine" from working - and the fuel is magic. (Nanny Plum knows that the Elves hate magic, so she asks the Wise Old Elf why the Great Elf Engine is fueled by magic. The Wise Old Elf says that magic "has a low carbon footprint and it never stops working".)A magical card arrives at the Little Kingdom, inviting everyone to a party at Granny and Granpapa Thistle's castle. The party is full of wonderful surprises and Granpapa shows everyone his funny hobbies. King Thistle catches a cold, so Ben, Holly, and Nanny Plum collect the ingredients for a magic potion to make him heal sooner or later. Everyone is visiting snooty King and Queen Marigold's Castle. King and Queen Marigold give them a which features a room made of ice sculptures and an upside-down room. Mr. Elf is overworked, so King Thistle sentences him to a holiday. He isn't too pleased. Mrs. Elf and Ben, however, are overjoyed by the news. Meanwhile, Nanny takes over the food deliveries. King Thistle's birthday has come around again and he's not happy. He does not want a birthday party but everything has been prepared. Poor Gaston the ladybird has never had a birthday party...