He first appears as a background character who makes several cameos, starting with "The China Probrem" when he appears in Kyle's nightmare. He is one of many in a line seen watching Tiger Woods play golf in "Sexual Healing". In "The Problem with a Poo", he appears in this episode at a City Council meeting where the council decides to cut the budget of Mr. Hankey's Christmas pageant by half.
He is revealed to be Red's father "The Pandemic Special". While the students are quarantined in school for two weeks, they are only given five minutes to have Zoom calls with their parents in the computer lab. Red is seen on a call with her parents. Mr. McArthur tells her that they miss her and cannot wait for quarantine to be over.
Mr. McArthur has dark brown hair. He wears a brown v-neck pullover with a light brown neckline, under which he wears a brown collared shirt. He wears dark gray pants with a black belt and black shoes.
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- "The China Probrem" - Appears in Kyle's nightmare.
- "Sexual Healing" - Stands in line while watching Tiger Woods play golf.
- "The Coon" - Tries to get a picture of Mysterion.
- "Broadway Bro Down"
- "Reverse Cowgirl"
- "Faith Hilling"
- "A Scause For Applause"
- "Naughty Ninjas" - Seen protesting outside Park County Police Station.
- "Truth and Advertising" - Asks Mr. Garrison if he has a minute for gay rights outside Whole Foods Market.
- "The Damned"
- "Douche and a Danish"
- "The Problem with a Poo" - Seen at the City Council meeting.
- "The Scoots" - Seen at the Park County Community Center.
- "Bike Parade"
- "Mexican Joker" - Watches Stan Marsh plead his father's case to ban home-grown marijuana.
- "Let Them Eat Goo" - Seen at the announcement for Tegridy Burger.
- "Season Finale" - Attends Randy Marsh's trial.
- "Christmas Snow" - First speaking line.
- "The Pandemic Special" - Seen on his way to the Town Square and is later seen talking to his daughter on Zoom.
- "Back To The Cold War"
- "Credigree Weed St. Patrick's Day Special" - Seen at the Party O’ Cools Irish Pub.
- ""South Park" Christmas Snow (TV Episode 2019)". IMDb.com.