The red thing returns to cause chaos, and Rogg chases it into the swamps, seemingly losing his life in confronting the creature.

A long-necked monster emerges from the Trap Door and eats the breakfast that Berk has prepared for the Thing Upstairs. Afterwards, a big, angry red monster chases Berk and Berk has a hard time getting rid of it again.

A many-legged creature comes out of the Trap Door and scuttles off down the corridor. Berk goes in search of it and finds an enormous black spider dropping down in front of him.

A creature known as the Splund comes out of the Trap Door and teases Boni and Drutt, while Berk is sewing the Thing Upstairs' pajamas.

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 for him to fight.

Berk is trying to take some photographs of his friends, when a flying creature comes out of the Trap Door. Berk has seen it before and knows that it gives the Thing Upstairs pimples if it gets near him.

Berk, Boni and Drutt go down to the swamp outside the castle to do some fishing. Berk has left the Trap Door open and is soon surprised by an enormous pink monster who creeps up behind them.

One of the Thing Upstairs' eyeballs falls down the Trap Door and Berk has to go after it.

Berk and Boni have problems with a seemingly endless plague of creepy crawlies coming out of the trap door. Berk uses a bugpipe to lead the creatures far from the castle.

Boni is bored, but Berk doesn't have time to talk to him. Then Rogg appears from the trap door and throws Boni from the top of the castle. Berk is then left talking to himself.

The Thing 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 what he believes to be the rotten one. Meanwhile, a giant muddy thing goes after Drutt.

Berk loses his patience with Drutt and throws him down the Trap Door, but he eventually decides to get him back by fishing him out.

It is Boni's birthday, so Berk makes a cake for him and Rogg also joins the two for the party. Drutt is hiding, for initially unknown reasons.

While Berk is giving the Thing Upstairs a slime bath, Drutt mistakenly pulls up a dragon from the trap door.

Berk is trying to nail the Trap Door down, but it's no good - a large peculiar looking creepy thing comes popping up and changes Berk, Boni and Drutt into all sorts of different shapes.

A blue devil comes up from the trap door and starts casting annoying spells on everyone. Boni gets a body and starts making goat noises, Berk changes orange, then red, then grows large, and Drutt continuously changes color.

Berk, Boni and Drutt play Hide and Seek while the Thing Upstairs is on holiday, until a horrible yellow thing comes up through the Trap Door and interrupts.

Berk throws a large amount of rubbish down the trap door, filling it up to the top, but this summons ghosts that torment him for his years of improper waste disposal.

Berk is tidying up and finds an old radio which starts to a familiar tune. As it plays, Rogg and other assorted creatures come out of the Trap Door to dance about. The Thing Upstairs, however, is not amused.

A creature comes out of the Trap Door and lays some eggs which hatch into green exploding creatures. Berk concerned with the mess decides to push it all down the Trap Door.

Berk is asleep. Three monsters, called the Big Mouths, appear out of the Trap Door. They eat everything in sight and make a complete mess of the place.

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 more wood, Berk opens the Trap Door and a huge octopus-like creature emerges, creating havoc in the kitchen.

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.

Boni has been complaining of boredom again, but Berk has planned a picnic at the swamp. First though he has to see the Thing Upstairs. Meanwhile, a tentacle pulls Boni down the Trap Door.

Fed up with running around after the Thing Upstairs, and fending off the trap door monsters, Berk leaves.