Kevern Zaksor

Baby-Fark McGeezak, real name Kevorn Zaxor, posed as a notorious gangster who was under pursuit by the Intergalatic Police for stealing "space cash." He held Planet Earth hostage while he forced Randy Marsh and Stan Marsh to build a warp drive.

Stan, after much persuading by Randy, then stabs Baby-Fark and he is presumed dead.

Later on, he is revealed to be an Ambassador to new world testing, and that the entire chain of events was a test to see if Earth was worthy of joining the intergalactic community, known as the Federation of Planets. He tested humanity by giving them space cash and seeing if they would return it to the aliens. They failed miserably and spent it all until Baby-Fark revealed that space cash is only worth what the humans decide it is worth. He berated the humans for their evident stupidity. As punishment for not returning the aforementioned space cash, the Earth is isolated from the rest of the Universe forever. Baby-Fark, or Kevorn, is never seen again and presumably returns to the Federation.