Liam Neeson: Gawain
Arthur : Where hides evil in my kingdom, then?
Merlin : Always... where you never expect it. Always.
Gawain : I know where.
Arthur : Where, Sir Gawain?
Gawain : I cannot say.
Arthur : You must speak your heart. You sit at the Round Table. Where is this evil?
Gawain : He's our best... and our bravest... why, then, is he never here? Without Lancelot, this table is nothing! Is there anyone here who doesn't think him a god? And now to be driven from us
[points to Guenevere]
Gawain : by a woman's desire!
Guenevere : In the idleness that comes with peace, I see that gossip has bred its own evil! I will forgive your hasty words. Come... drink from Lancelot's cup, and partake of his 'goodness'.
[the cup is passed to Gawain, who proceeds to slam it upside-down on the table in defiance of Guenevere]
Arthur : You DARE accuse the Queen, Gawain?
Gawain : I do!
Guenevere : I protest my innocence!
Arthur : [standing up and drawing Excalibur threateningly] WERE I NOT KING, I WOULD MAKE YOU PAY WITH YOUR LIFE FOR WHAT YOU'VE SAID!
Guenevere : Will you not champion me?
Arthur : I cannot! I am your King, and I must be your judge in this. Lancelot must do it. He also stands accused. I decree - that at sunrise, two days from now, the champions will meet, and the truth shall be known. For by the law of God, no knight who is false can win in combat with one who is true.