Heidi Turner
| Gender | Female |
| Age | 10 |
| Hair Color | Light Brown |
| Occupation | Student |
| Grade | 4th Grade |
| Aliases | Marcie |
| Religion | Roman Catholic |
| Mother | Mrs. Turner |
| Father | Mr. Turner |
| Voiced by | Jessica Makinson |
| First Appearance | Rainforest Shmainforest |
Featured Episodes
- South Park: Bigger, Longer & Uncut (cameo)
- Rainforest Shmainforest (s03e01, cameo)
- Spontaneous Combustion (s03e02, cameo)
- Tweek vs. Craig (s03e05, cameo)
- Hooked on Monkey Phonics (s03e13)
"Mr. Hankey's Christmas Classics" (s03e15) "Do the Handicapped Go to Hell?"(s04e09) "Probably" (s04e10) "Helen Keller! The Musical" - She is shown crying over her dead dog Robbie. "Proper Condom Use" - She is scared with the other girls that they might get pregnant. "Bebe's Boobs Destroy Society" - She is seen having lunch with Bill Allen. "It's Christmas in Canada" - She was upset with Cartman, Kenny, and Clyde. "Stupid Spoiled Whore Video Playset" "Marjorine" -
- Follow That Egg! (s09e10, cameo)
"Cartoon Wars Part I" - She was seen at the "Park County Community Center.
- The List (s11e14)
- Eek, A Penis! (s12e05)
- Super Fun Time (s12e07, cameo)
- Breast Cancer Show Ever (s12e09, cameo)
- Elementary School Musical (s12e13, cameo)
- The Ring (s13e01, cameo)
"Eat, Pray, Queef" - Her and the other girls had Samantha Dunskin queef on Butters. "Insheeption" - She was seen having lunch with the girls clique "Funnybot" - Seen in the background. "Reverse Cowgirl" - Appears on one of the bathroom screens sitting on the toilet.
- The Tale of Scrotie McBoogerballs (s14e02)
- Medicinal Fried Chicken (s14e03, cameo)
- Ass Burgers (s15e08, cameo)
- Bass to Mouth (s15e10, cameo)
- Cash For Gold (s16e02, cameo)
- Faith Hilling (s16e03, cameo)
- Jewpacabra (s16e04, cameo)
- Butterballs (s16e05, cameo)
- Cartman Finds Love (s16e07, cameo)
- Going Native (s16e11, cameo)
"Raising the Bar" - Seen in the Gym when Cartman talks about anorexia.
- A Scause For Applause (s16e13, cameo)
- Let Go, Let Gov (s17e01, cameo)
- Ginger Cow (s17e06, cameo)
- World War Zimmerman (s17e03)
"Taming Strange" - Seen in the background in Mr. Garrison's class.
- The Hobbit (s17e10, cameo)