The Imperial Sludge is a villain from the science fiction series, Starfarer. In the series, he surrounds the character Fritz Donnegan, who escapes by reversing the polarity of the ship's gravity transducer. The Imperial Sludge uses an Illuma-Sword.
Lloyd reads a Starfarer comic with the Imperial Sludge in a face off with Fritz Donnegan and tells the ninja that he needs to go to Ninjago Doomsday Comix to learn what happens next in the next issue of Starfarer.
At Buddy's Pizza, a kid is seen reading the same issue that Lloyd was reading, showing the standoff between the Imperial Sludge and Fritz Donnegan.
To win Illuma-Swords, the Lloyd participates in a trivia contest against a Fritz Donnegan cosplayer, where Fritz Donnegan's escape is revealed.
While on the circus train, Cole is seen reading the issue of Starfarer where Fritz Donnegan is in a standoff with the Imperial Sludge.
The Imperial Sludge is a dark shadow being who has two white eyes and appears to be taller than Fritz Donnegan. He holds an Illuma-Sword.
- 18. "Child's Play" (pictured)
- 28. "The Art of the Silent Fist" (pictured)
Behind the scenes
- The Imperial Sludge appears to be based on Darth Vader from the Star Wars franchise.
- In the Czech dubbing, he is mistaken for real non-living sludge.