- "寻死" - Marvin's first appearance. He tries in various ways to get Stan to kill him because he is too old to do it himself.
- "Cartman's Mom is a Dirty Slut" - Wins first prize at America's Funniest Home Videos with his video of Kenny's death.
- "City on the Edge of Forever (Flashbacks)" - Seen in a flashback.
- "The Red Badge of Gayness" - Marvin participates in the war reenactment and helps Stan and Kyle foil Cartman's plans. He also says Kyle's usual line after Kenny gets killed.
- South Park: Bigger, Longer & Uncut
- "Quintuplets 2000" - Marvin disapproves of the boys going to the Cirque de Cheville. Later, he has a one-night-stand with the grandmother of the quintuplets (which is, ironically, her last-night-stand). Marvin also tries to get one of the soldiers to kill him.
- "A Very Crappy Christmas" - He says he wants to die.
- "Grey Dawn" - Marvin has his driving license taken away as part of a program to strip senior citizens of their driver's licenses. Marvin later participates in the revolt of senior citizens being led by the AARP.
- "Something Wall-Mart This Way Comes" - Marvin is employed as a greeter at Wall-Mart.
- "Trapped in the Closet" - Seen at dinner with the Marshes where it is mentioned that he is an alcoholic, at least at this time and in the opinion of Randy.
- "Fantastic Easter Special" - Marvin is shown to be a member of the Hare Club for Men, as all the male members of the Marsh family have been for generations.
- "Cash For Gold" - He, like many other senior citizens, is tricked by J&G Shopping Network into thinking that the jewelry he buys for Stan is worth thousands (when really the price is in single digits to a little over 10 dollars).
- "Freemium Isn't Free" - He is shown to have a gambling problem, he is later seen playing board games with Stan.
- "Truth and Advertising"- Seen sitting at the table with the Marsh family eating dinner.
- "PC Principal Final Justice"- Seen eating with the family.
- "Member Berries" - Seen eating with the family.
- "The End of Serialization as We Know It" - Seen watching the news with his family.
- "Hummels & Heroin" - He was supplying his grandson, Stan, drugs to smuggle in cushions (unknowingly to the latter) for birthday entertainers in exchange for German Hummels, so he'd be the "top bitch" in Shady Acres. At the end of the episode, he successfully becomes head bitch.
- "Time To Get Cereal" - He sees the boys being arrested on television.
- "Nobody Got Cereal?" - He reveals that he and the other people at the retirement home made a deal with ManBearPig, when they were younger.