Berk is busy preparing his master's breakfast - from worms and other vile concoctions, when a strange yellow creature comes out of the trap door in the kitchen floor and eats the breakfast, closely followed by a large Big Red Thing which chases Berk until Berk hides behind a mirror - the ugly monster gets a nasty shock and retreats down the trap door.
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Berk is trying to put up some shelves for his master and is using Boni as a prop to hold up the shelf. Looking for some more wood, Berk's opens the trap door, but a huge octopus-like creature emerges with writhing arms and creates havoc in the kitchen.
Berk is instructed to go and see to the garden. He goes out to feed the plants, especially Thort, his master's favourite vegetable.
Berk, Boni and Drutt go down to the swamp outside the castle to do some fishing. Boni is moaning because he finds it boring, but Berk has left the trap door open and he is soon surprised by an enormous pink monster who creeps up behind them. Berk is so frightened he falls into the swamp, only to find the monster is friendly and wants to join in.
Berk is cooking again, when something invisible comes out of the trap door and starts throwing things about. Berk scores a direct hit in retaliation with some yellow goo and the little creature - Bubo - becomes visible and bright yellow. When Berk eventually catches the naughty Bubo, he finds a hole in the top of his head, blows him up like a balloon and lets him off into the air and lets him drop back down the trap door.
Something large and black with "lots of legs" comes out of the trap door and scuttles off down the corridor, but Berk won't believe Boni. He goes in search of it and finds a tiny spider, thinking it must be Boni's monster, but just then the enormous black spider drops down in front of him, wraps him in thick green web and chases him into the kitchen. Drutt spins the spider up in his own web and Berk is able to push it back down the trap door.
Boni is bored, but Berk doesn't have time to talk to him. Then Rogg appears from the trap door and takes Boni out 'to play' on top of the castle ramparts. Boni talks and talks and bores Rogg until he falls off the castle on top of Berk, who has come in search of Boni. Boni is left talking to himself...
Berk and Boni are going through things in a room that's been left untouched for a long time. Berk finds an old book of spells and reads one out, summoning up the 'Ghostly Ghoulies' .
The Thing Upstairs has a cold, so Berk makes him some of his special medicine. Meanwhile, a 'horrible green gobby lump' comes out of the trap door and drinks all the medicine, with strange results. As Berk drags the little green thing back to the trap door, he finds the creature's mum has come out too - a large yellow lump. Berk, Boni and Drutt all end up with colds.
Berk is trying to nail the trap door down, but it's no good - a large peculiar looking Thingy comes popping up and changes Berk, Boni and Drutt into all sorts of different shapes, before eventually disappearing again, leaving them back to normal.
Berk is exhausted and falls asleep, but soon he is tormented by things and monsters, Boni is whisked down the trap door and Berk must rescue him ... but thankfully this time it is a dream.
Boni is pestered by Bubo, who has returned again to cause havoc. Berk goes to the rescue, but ends up in the swamp, menaced by swamp creatures. He manages to get out and teaches Bubo a lesson.
Him Upstairs has tooth ache and Berk is summoned to administer to him. Once he finds which head the bad tooth is in, Berk pulls out the rotten one - or does he?
Him Upstairs is asleep and so is Boni. Meanwhile a little thing comes out of the trap door and zooms about so that Berk cannot catch it. Each time it stops it emits a loud fog horn. To Berk's horror, it goes upstairs and into his master's bedroom. Just as he catches the thing, his master wakes up and angrily takes it out on Berk ...
Berk is tidying up and finds an old radio, which starts to play the Trap Door theme song. As it plays Rogg and other assorted creatures come out of the trap door and dance about. Him Upstairs, however, is not amused...
Berk is told to throw out the rubbish and decides to throw it down the trap door. But Rogg appears and eats it all up with relish. He then climbs into the dumb waiter and wonders into Him Upstair's boudoir, which lands Berk in trouble.
Boni is asleep. A creature comes out of the trap door and lays some eggs. Berk comes in and see the eggs hatch into green creatures. These creatures then explode into yellow gunge which looks like scrambled eggs. Berk concerned with the mess decides to push it all down the trap door. Boni wakes up having seen nothing and suggests that scrambled eggs would be a good idea for breakfast.
Berk is trying to take some photographs of his friends, when a 'flyin' wotsit fingy' comes out of the trap door. Berk has seen it before and knows that it gives Him Upstairs pimples if it gets near him.
Boni has been complaining of boredom again, but Berk has planned a picnic at the swamp. First, though, he has to see Him Upstairs.
Berk is asleep. Three monsters, Big Mouths, appear out of the trap door. They eat everything in sight and make a complete mess of the place.
Berk is feeling a little under the weather and takes some of his own special home-made medicine to cure his headache, but the effects are rather frightening to Boni, as Berk evolves into a vicious looking monster...
Berk is trying to unblock the drains. The trap door has been left open and Boni is worried about what might come out.
Berk is throwing rubbish down the trap door and Boni is worried about the consequences. Something comes out of the door. Meanwhile Berk is busy creating food. The monster looks like a pile of rubbish and Berk picks a bit of it up thinking it could be suitable for his cooking creation. The monster spits rubbish first at Berk, then at everybody and over everything. Berk tries to stop it spitting by sticking a cooking utensil in its mouth. No longer able to spit, the monster blows up and covers them in gunge.
Berk is looking for mushrooms for Him Upstairs. He tries to pick one and it bites him. Berk is furious and chases after it determined to catch it. The mushroom leads him all over the place, until eventually Berk catches up with him near a bog. The mushroom kicks him and Berk falls into the bog. Berk decides to give up the chase and sets off for home. He gets lost - but eventually finds his way back and ends up climbing through the trap door. Boni sees Berk emerging from the door and is convinced it's a monster as Berk is covered in muck from his fall into the bog.
Berk is busy tidying up, when he realises that he is surrounded by monsters that have come out of the trap door. At first he can't understand how the monsters got in, but realises he must have left the trap door open when he was clearing the rubbish away.