Black Adder the Third: Amy and Amiability (1987)

To alleviate the Prince Regent's financial problems, Edmund Blackadder (Rowan Atkinson) arranges for the Prince (Hugh Laurie) to marry the fabulously wealthy Amy Hardwood (Miranda Richardson). A series of improbable plot twists result in Edmund tying the knot with Amy himself. Worse yet, Amy turns out to be "The Shadow," a notorious highwayman (or highwaywoman?). Also known as "Cape and Capability," this Blackadder episode originally aired in England on October 15, 1987. ~ Hal Erickson, All Movie Guide