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)
- AWESOM-O (s08e05, cameo)
- Follow That Egg! (s09e10, cameo)
- With Apologies to Jesse Jackson (s11e01, cameo)
- 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)
- 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)
- A Scause For Applause (s16e13, cameo)
- Let Go, Let Gov (s17e01, cameo)
- Ginger Cow (s17e06, cameo)
- World War Zimmerman (s17e03)
- The Hobbit (s17e10, cameo)
"Mr. Hankey's Christmas Classics" - Singing in the song. "Do the Handicapped Go to Hell?" and "Probably" - She is first introduced (as Marcie). Her Father tries to stop her from joining Cartman's church, but gets killed in the process. "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" - Seen with the "stupid spoiled whores". She was also seen at Bebe's party. "Marjorine" - Heidi holds a sleepover, which Butters (disguised as a girl) attends in hopes of stealing her fortune telling device. "Cartoon Wars Part I" - She was seen at the "Park County Community Center. "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. "Raising the Bar" - Seen in the Gym when Cartman talks about anorexia. "A Scause For Applause" - Seen in the background in the school hallways talking to Annie Faulk. Stan Marsh is cited to have asked her for a bottle of superglue. "Taming Strange" - Seen in the background in Mr. Garrison's class.