King Arthur and the Knights of Justice1992

Queen Morgana:
Your twin brother Sir Lancelot was one of Arthur's knights. When he could no longer stand Arthur's evil, he left for a distant land. Our plan was to have you ride to Camelot and pretend you were Sir Lancelot.

Lance:
What was I to do in the castle?

Queen Morgana:
Two nights after you are back in Arthur's confidence, you will lower scaling ropes from the castle's battlements, disable their defenses and lower the drawbridge so we can enter.

Lord Viper:
[chuckling] I know you will not let you queen down, Sir William. Or should I say, Sir Lancelot.