This is the story of the Knight of The Iron Castle, living in a mythical creature forest. Despite his hard shell made of cans, corrugated iron, barbed wire and metal nails, he is a soft and at the same time anxious fellow. So it is understandable that he prefers playing with his plushy over jousting, although he keeps boasting about his deeds as a "Strong Undefeated Knight".
Until one day, the king informs the knight that he, himself, will host a tournament at his castle.
His buddy, meanwhile, is left alone. "When the cat is out of the house - the mice dance on the table". Of course, the cheeky friend does not adhere to the "Chivalrous Orders" and is up to mischief. Should he first smear the stairs with soft soap, romp around in bed, or rather rummage through treasure chests and wardrobes? And unexpectantly at midnight, a ghost arrives looking for a new place to haunt. After initial apprehension, the two become friends. They try their hand at teaching each other how to roast marshmallows in the fireplace and how to haunt each other!
Will The Knight find them out before the tournament? Will he even go to the tournament?