I've seen Ms. Heather Elizabeth Langenkamp in sixteen roles. Here they all are, starting with her best, ending with her worst.

Herself in New Nightmare
Nancy Thompson in A Nightmare on Elm Street
The girl in ZZ Top's "Sleeping Bag" music video
Callie Wells in Nickel Mountain
Paula Finkle in ABC Afterschool Special: "Can a Guy Say No?"
Nancy Thompson in A Nightmare on Elm Street 3: Dream Warriors
Suzanne Hicks in Fugitive Mind
Marie Lubbock in Just the Ten of Us: "Strangers in the Night"
Beth in Passions
Lou Ann Solomon in Perversions of Science: "The Ultimate Weapon"
Hope Sherman in Suburban Beat
Dorothy in The Butterfly Room
Erica in CBS Schoolbreak Special: "Have You Tried Talking to Patty?"
Christy Carruthers in The Demolitionist
Victim in Shocker
Nancy Kerrigan in Tonya & Nancy: The Inside Story