Editing Marvin Marsh (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== Marvin Marsh's voice is provided, like his son and grandson, by series co-creator Trey Parker. During recent seasons, Trey has joked he and Matt will eventually write more episodes about the character as they grow older, in response to the fact he and Matt have focused more on [[Randy Marsh]] in later seasons as they have aged. 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)