Chester Yapsby
Full Name: Chester Yapsby
Alias(es): No Known Aliases
Gender: Male
Age: Unknown
Build: Weedy
Hair: Black with gray streaks
Eyes: Unknown
Skin: Unknown
Hometown: Unknown
Professional Info
  Mad Scientist
Lab Assistant (former)
  No Known Affiliations
  No Known Relatives
  No Known Friends
Love Interest(s):
  No Known Love Interests
  No Known Pets
  Kim Possible
Ron Stoppable
Behind the Scenes
First Appearance:
Voiced by:
  Stephen Root

Chester Yapsby was a former lab assistant for Professor Acari who turned to evil to pursue his outlandish ideas. He stole the Roflax from Acari's lab, and used it to create an army of giant cockroaches that terrorized Middleton.


Chester Yapsby was a lab assistant for entomologist Professor Acari, until they had a heated disagreement which led to Yapsby being fired over his outrageous ideas. Yapsby returned to Acari's lab to steal the Roflax, a device which promoted the growth of exoskeletons in insects. He used it to create an army of giant cockroaches which stampeded through Middleton. He was later foiled by Team Possible with the help of Roachie, a mutated cockroach which did not get the full growth treatment.



  • Roflax



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His only know lair is in a tunnel off of a sewer line where he grew his army of giant cockroaches with the Roflax.


Hair- black with gray streaks

Skin- slightly tanned


light sensitive goggles, green gloves, yellow shirt, green vest, green shorts and black boots.

Behind the Scenes

Voice Actor/Actress

He was voiced by Stephen Root

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