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Sergeant Hobo 678 was in charge of Zim's training session on Hobo 13. When the time came for Zim's team

to pick a leader, Sergeant Hobo 678 told them to choose carefully, as their success would depend on their leader'scompetence. However, Zim voted himself before the Sergeant could even finish his sentence, and won by default of silence. Zim then went on to get all his teammates eliminated, to the extreme disgust of Sergeant Hobo 678.

The Sergeant ultimately fought Zim, and was gaining the upper hand until Zim used his technique of siphoning energy from the Sergeant's suit into his; this gave Zim the power to knock him out of the ring they were duelling in, and win. Sergeant Hobo 678 and Skoodge were soon attacked by the dreaded Hogulus that appeared earlier in the episode, with the Sergeant hypocritically bashing Skoodge against the head of the beast in an attempt to get him free of its mouth. He was never heard from again follwing this event.

Sergeant Hobo 678 was voiced by the legendary R. Lee Ermey, a former drill sergeant famous for his role as Gunnery Sergeant Hartman in the film Full Metal Jacket. Since then, he has spent much of his acting career playing similar characters, many of them parodies of his "hard-edged drill sergeant" image.

Facts of DoomEdit

• He was one of the few characters that truly scared or intimidated Zim. However, Zim was quick to gloat after defeating the Sergeant.

Characters of Invader Zim
Main Characters
Dib • Gaz • GIR • Zim
Supporting Characters
Almighty Tallest Purple • Almighty Tallest Red • Ms. Bitters • Professor Membrane
Minor Characters
Invader Skoodge • Keef • Minimoose • Tak • President Man • Roboparents • Lard Nar • Skool Principal
Background Characters
Adult Dib • Old Kid • Hobo • Alan • Meef • Skoolchildren
Temporary Characters
Mortos der Soulstealer • Sergeant Slab Rankle • Sergeant Hobo 678 • Shadow Hog • Chickenfoot • Sizz-Lorr • Gashloog • Willy • Iggins • Walton Chunky • Pigboy
Canceled Characters
Louie • Digestor • Almighty Tallest Spork • Almighty Tallest Miyuki • Bloody GIR • Cthulu • Cybernetic Kitten • Dinky • Little Timmy