"That Sinking Feeling" is the third episode of Darkwing Duck. It is the first single-part episode of the series, and the first episode to air, originally being broadcast as a "spring preview" episode on the Disney Channel. Darkwing Duck creator Tad Stones has stated this to be his personal favorite episode.
A sinister genius marketer and mole named Moliarty plots to plunge everything into darkness and seize control of the surface city of St. Canard - by stealing buildings and creating a beam to lock the moon into an eternal eclipse, with the help from his fellow race.
"The city of St. Canard is home to a thousand criminals. But not one of them dares make a move, for this city has a shadowy protector who hunts them like a phantom in the darkness. I am that guardian. I am the terror that flaps in the night. I am the winged scourge that pecks at your nightmares. I am Darkwing Duck! And I am... totally bored out of my skull!"