Jeff and Erik
Gender: Male
Species: Yugopotamian
Personal Information
  Mark Chang
  Radioactive waste
Mark Chang (friend)
Production Information
First Appearance:
  Totally Spaced Out
Last Appearance:
  Scary Godparents
Voiced by:
Carlos Alazraqui (Jeff)
Butch Hartman (Erik)
"Radioactive waste!"
— Erik
"Dude, that's the best kind of waste there is. My parents only get me medical waste!"
— Jeff

Jeff and Erik are two Yugopotamians who are Mark Chang's best friends.


Jeff and Erik fulfill the role of side characters and buddies to Mark Chang in several episodes. Much like their best friend Mark, they speak in a teenage "surfer dude" type slang and act like typical Earth teenagers. For instance, they call their space journey to Earth a "road trip". Not much is known about them individually, other than they love to eat disgusting stuff like radioactive waste, like any other Yugopotamian.


Jeff is tall and blue, while Erik is short and pink. Jeff also has braces like Chester McBadbat's.


They first appeared in "Totally Spaced Out", where they help Mark when he returns to Earth and capture Vicky. Jeff and Erik once again joined Mark in "Scary Godparents", where they journeyed to Earth at a time most dangerous to Yugopotamians; Halloween, surrounded by lethal candy. When Jeff attempted to handle candy, it burnt through his space suit and hand. Mark and his friends were there to rescue Vicky before the Pumpkinator could destroy Earth, but were forced to flee after Timmy "declared war" on them so that King Gripullon would bombard Earth with candy. While Mark was despondent about having to leave behind Vicky, Erik cheered him up by pointing out he could have a clone of her made. This was the last time Jeff and Erik appeared in the series.

Jeff and Erik

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