King Stupid and Goober update the software on the stupidity-controlling console and discover it has two new components, Dead Leg X-L Rater and Virtual Stupidity. They can't resist playing tricks on humans and each other.

King Wonderful comes to visit. He quickly outstays his welcome, and Goober and King Stupid hatch a plan to get rid of him.

King Stupid and Goober discover they have a mischievous spirit - a boggart - in the castle. The boggart plays practical jokes on them and they try different ways to get rid of it. Despite being hounded and haunted, King Stupid still finds time to create stupidity down in the human world. Today his victims include Terry who makes very bad decisions, a boy who thinks he is a football manager and a mother who wants to be just like her teenage daughter.

Goober enters the Ether World Cookery Competition and submits his home-made Rory Grue, a gremlin delicacy. King Stupid is dismissive of Goober's cooking until he sneaks a taste and is instantly hooked.

Goober researches his family history and finds a portrait of King Stupid, which he sends to an ancestry website on the King's behalf. The website reveals Stupid's darkest secret - that he is half-human.

The King's identical twin, Count Cruel, comes to stay. Cruel manages to get King Stupid out of the castle so he can use the stupidity console to wreak cruelty on Earth.

King Stupid can't stand Bargest the dog's incessant howling, so orders Goober to swap him for a nice, cute pet. Goober is tricked by the pet shop owner and brings back a vicious, wild, mythical creature called a Chupucabra. Goober tries to train the Chupucabra but it escapes and they are both in fear of being eaten alive.

Goober is taking part in a Gremlin Swap programme, and goes to stay with another Deed Monarch. Goober's temporary replacement is Nosey, gremlin butler to Queen Curious, who drives King Stupid mad with his endless questions. Stupid soon tires of this non-stop nosiness and knows the only way to get Goober to return is by tricking him.

King Stupid goes in search of fame - he tries to write a novel, become an actor and even record a song. It turns out that fame isn't all it's cracked up to be.

King Stupid and Goober are worried. Judith Bibble, a young reporter from the human television show Newsround, has worked out they exist. If they are exposed, they'll be banished from the Ether World.