Ok i think i will.
In the Middle ages before the time Arthur took to the throne a Troll from the west arrived at the castle.
The Troll was but a mere child asking for food. This troll had no food or water to live on and was near dying
The young troll was given the name Reginald by his parents that had died mysteriously died one day.
As young Reginald approached the castle people gave him strange looks and some pointed and made fun of him.
Male Passerby #!: Ahahaha! Look at that ugly thing!
Female Passerby: ooooh what a hideous creature!
Male Passerby #2: Man when my uncle said his friend turned into a troll he wasn't kidding!
As he pressed on he saw what appeared to be the leader of the humans (the current king at the time)
Reginald went up to the king and tugged on his sleeve gaining the king's attention.
Reginald: Would you be so kind as to part with some food and drink?
But the King was not of the friendly sort and with much disgust he said.
Cruel king: Throw this beast out of our castle and if it ever comes back kill it!
Now the guards knew that even though the troll's looks were "not so fine" it was still a child so they arguably refused.
Guard #1: But sire it's just a child!
Guard #2: You can't possibly turn this hungry kid can you?!
Guard #3: There's no way i'll do such a thing to a starving child!
Cruel king: (Angry) You dare disobey you're King! Either you get this Beast out of my castle or i will have both of your heads on a platter!!!
Guards 1-3: *Gulp*
Then the guards obeyed their king and threw the troll out of the castle.
Reginald cried and cried then collapsed on the ground in exhaustion.
Now Reginald would have died that day if he hadn't have been rescued by a group of trolls that were hunting for food.
After waking up and meeting the other trolls he lived a happy life with the others
In the end Reginald became their leader, Mastering all the arts of "Troll Magic" and Weaponry he remembered to take revenge on the King, but not to his knowledge the old king was no more and young Arthur had took to the throne.
Reginald arrived again at the castle after many years past but this time with a army behind him.
This time he was met by a army of soldiers.
As the two armies clash Reginald cast a spell on the Kingdom and turned it into a life size board-game.
In all the confusion Reginald took arthur hostage in which he was asked many questions during the confusion the main one being "Where's the king?" but soon after he realized that arthur was the king he no longer cared so he then put Arthur's crown on his head proclaiming himself the "Troll King".
I think that about does it for the script for the intro.