Editing Hummels & Heroin (section) Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.Anti-spam check. Do not fill this in!==Behind the Scenes== Marcus Preston is voiced by Josh Gad, who is best known for voicing Olaf in Disney's Frozen and originating the role of Elder Cunningham in The Book of Mormon. He has also been a producer for this season of South Park as well. Summary: Please note that all contributions to South Park Wiki may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here. You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see South Park Wiki:Copyrights for details). Do not submit copyrighted work without permission! Cancel Editing help (opens in new window)