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
- Proper Condom Use
- Bebe's Boobs Destroy Society
- It's Christmas in Canada
- Stupid Spoiled Whore Video Playset
- Marjorine
- Follow That Egg! (s09e10, cameo)
- Cartoon Wars Part I
- 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
- Insheeption
- Funnybot
- Reverse Cowgirl
- Cash For Gold (s16e02, cameo)
- Faith Hilling (s16e03, cameo)
- Jewpacabra (s16e04, cameo)
- Butterballs (s16e05, cameo)
- Cartman Finds Love (s16e07, cameo)
- Raising the Bar (s16e09, cameo)
- A Scause For Applause (s16e13, cameo)
- Let Go, Let Gov (s17e01, cameo)
- World War Zimmerman (s17e03, cameo)
- Taming Strange (s17e05, cameo)
- Ginger Cow (s17e06, cameo)
- The Hobbit (s17e10, cameo)