"Quailman VI: The Dark Quail Saga" is the thirtieth episode of Doug.
Doug is upset because Patti is going out with Guy to a big movie premiere in Bloatsburg. In the Quailman segment, Quailman tries to save Ms. Mayonnaise from Dr. Rubbersuit, but Rubbersuit traps him under a big foot. The Golden Salmon rescues Quailman and revives him. Later, the Golden Salmon disguises himself as Rupert Schmupert. Rubbersuit yanks out Quailman's evil twin, the Dark Quail. A giant slug slithers into the room slips into a Rupert Schmupert suit and mask and tries to get to Ms. Mayonnaise. After splitting the Dark Quail back together, Quailman tries to warn her about dating a giant space slug. Quailman asks Patti to share his Quail Powers with her, and gives his Quail Belt to Patti, who puts it on. Patti, who uses Quailman's powers, unmasks the slug, and kisses Quailman. After the dream ends, Doug asks Patti that she can go skating on Sunday, but she can't, and he moans painfully. Seconds later, Doug is joined by Patti.
- In the book Slimed!: An Oral History of Nickelodeon's Golden Age, Doug creator Jim Jinkins mentioned that, while he agrees with the fans who prefer the original Nickelodeon series, this is his personal favorite episode of the Disney series.