Knightmare.com

...Except it isn't. It's a parody of Brandy by Scott English (1971), famously covered by Barry Manilow (1974).

Sung from the perspective of a latter-day Hugo Myatt a.k.a. Treguard. Official audio of Mandy; official karaoke (you know you want to) with original lyrics

Don't remember every quest
I forget some, I confess
The cycle of the years
Each phase of adventure
Greeting dungeoneers
Wond'ring: "Who sent ya?"

Knowing if they choose the cup
Pretty soon their number's up
Mondays at the start
Then it was Fridays
But always in my heart
The post-mortem catchphrase

Ooh nasty
Well you came and you gave into danger
And I sent you away
Ooh nasty
I dismissed you then said, "Enter, stranger"
There's a new game to play
Ooh nasty

And at the end of Series 8
Said farewell to something great
Though the details fade
Of spells and portals
The comments that I made
Continue immortal

Ooh nasty
Well you came and you gave into danger
And I sent you away
Ooh nasty
I dismissed you then said, "Enter, stranger"
There's a new game to play
Ooh nasty

Memories may be vague
Yet I am right there
When I recall the phrase
I spoke on Knightmare

Ooh nasty
Well you came and you gave into danger
And I sent you away
Ooh nasty
I dismissed you then said, "Enter, stranger"
There's a new game to play

Ooh nasty...