pre-south park episode

Did you see the inteview with the south park creators on Coemdy Central? I saw the real audio version. The creators had an animate movie that was shown in the real audio clip. It is a pre-south park. I don't know if it exists anywhere. I am looking for it. If ya find it. let me know. It was the one with us invading north america, killing indians. Funny I thought. Just thought I would ask if ya know anything about it. I don't check newsgroups to much, so send me a cc if replying to this message.