Peter Nelson made his first appearance in "Make Love, Not Warcraft". He is a co-worker and friend of Randy Marsh at the South Park Geology office. Nelson is also a member of the Cult of Cthulhu, and the Hare Club for Men. In "Broadway Bro Down", he is revealed to have a wife.
Nelson has long gray hair and glasses. He wears a green shirt, pocket protector, and brown pants. He usually wears a green shirt except when he is attending a Cthulhu cult ritual, then he has a black robe.
Nelson seems rather calm and uninterested in whatever is going on. When Randy was showing off his avatar in World of Warcraft, he casually remarked on how it was killed easily by the griefer. Even when he is interested he still acts very passive about it such as football, marijuana, and blow-jobs from his wife.
- "Bloody Mary" - Mentioned.
- "Make Love, Not Warcraft" - He is seen as a co-worker looking at Randy's World of Warcraft game.
- "Fantastic Easter Special" - He is captured by Bill Donohue and is seen in a bunny costume.
- "Britney's New Look" - Seen taking photos of Britney Spears along with many other people.
- "Over Logging" - Randy tells Sharon he needs to send an email to Nelson before going to bed (mentioned only). He also is mentioned when the government is calling out names on whose turn it is to use the internet.
- "Medicinal Fried Chicken" - He and many others purposely gave themselves testicular cancer so they could buy marijuana legally.
- "Mysterion Rises" - Nelson is revealed as a member of "The Cult of Cthulhu."
- "Broadway Bro Down" - Tells Randy about taking his wife to Broadway musicals to get blow-jobs.
- "Reverse Cowgirl" - Randy mentions that he and Nelson make X's with their pee on sleepover nights (mentioned only).
- "The Cissy" - He is questioned about the identity of Lorde by SPIN reporter Brandon Carlile.
- "The Magic Bush" - Seen being spied on by Randy while having sex with his wife.
- "PC Principal Final Justice" - Seen in the crowd of people standing in front of the Whole Foods Market.
- "The Damned" - Seen briefly at Skeeter's Wine Bar.
- "Holiday Special" - Seen helping Randy pull down a Columbus Statue.
- "A Boy And A Priest" -Seen in church.
- "Tegridy Farms" - Tells Randy to move when he stops at a green traffic light, only for Randy to tell him to shut up.
- "Bike Parade" - Seen watching the bike parade.
- "Season Finale" - Takes part in Randy's trial.
- "South ParQ Vaccination Special" - Seen at the end celebrating the end of the pandemic.
- South Park: The Streaming Wars Part 2 - Works with Randy on the construction of a desalination plant. When the plant was destroyed by ManBearPig, Nelson becomes injured, and promptly reports the incident to Randy.
Peter Nelson is one of two playable characters in the game, the other being Randy.
- Randy has had several co-workers named Nelson; in "Goobacks", Randy is fired by a Mr. Nelson. In "Bloody Mary", an off-screen Nelson from work says goodbye to Randy.
- The Broadway Musical he took his wife to was called Wicked.
- ""South Park" Make Love, Not Warcraft (TV episode 2006)". IMDb.com.
- ""South Park" The Cissy (TV episode 2014)". IMDb.com.
- "This ("Make Love Not Warcraft") is the first time we meet Nelson, Randy’s co-worker at the Geology Station. ". @SouthPark on Twitter.com.