King Justin the Messy is worried. The Royal Family have had a very busy year touring the country for his Jubilee celebrations, but some things are not going to plan. The King's daughter Princess Nina is more concerned with working in her laboratory than finding a prince to marry, and most worryingly, things keep going missing. The King decides that whoever finds the missing items will be rewarded with his daughter's hand in marriage.

Nearby, on a small farm just outside the village lives a boy called Jack with his mum Dame Trott, his sister Jill and their cow Daisy. When Daisy runs out of milk, Dame Trott decides to sell Daisy and sends Jack off to market. On the way, Jack bumps into Fair Deal Fred who agrees to buy Daisy for 6 gold pieces, or so Jack thinks! On his return home Jack discovers that Fred has tricked him and has actually given him beans. Dame Trott is furious. Fortunately, Mr Bloom overhears the rumpus and decides to help the Trott family by planting the beans, using a little bit of compost from the Composterium and a sprinkling of water. But, as he knows, the beans will take a long time to grow. So it's time for a bit of Big World Magic from Tree Fu Tom, Treetops, the Pantomime Fairy and the audience who take their spell poses for the 'Grow Grow Grow' spell. Magically the beans start to grow, grow, grow!

Jack climbs the beanstalk, only to come face to face with the naughty Giant. Will Jack overcome the Giant and retrieve the missing CBeebies things?