== Karriere ==
Berthelsen fik i 2014 sin skuespildebut i kortfilmen ''Mirrors''. Hun fortsatte senere med at optræde i korte film som ''Natskygge'',<ref name="radio">{{Cite web|url=http://www.radiotimes.com/news/tv/2017-10-24/who-is-roman-in-stranger-things-2/|title=Who plays Roman in Stranger Things 2?|publisher=Radio Times|year=2017|access-date=9. november 2017}}</ref> ''Dyspno'' og ''Cape Fear''. I 2015 optrådte hun i den danske film ''Hybrid''. I 2017 blev hun i Netflix-original science fiction horror-serien ''[[Stranger Things]]'' castet som Kali / Eight, en karakter med evnen til at skabe [[hallucination]]er.<ref>{{Kilde nyheder|url=https://www.popsugar.com/entertainment/Who-Kali-Stranger-Things-44198641|title=The Awesome Thing You Don't Know About Eleven's "Sister" on Stranger Things|last=Roschke|first=Ryan|work=POPSUGAR Entertainment|access-date=2018-01-02|language=en-US}}</ref><ref name="vog">{{Cite web|url=https://www.vogue.com/article/stranger-things-linnea-berthelsen-kali-eight-shaved-head-purple-hair-millie-bobby-brown-Netflix|title=Stranger Things Actress Linnea Berthelsen on the Advice That Millie Bobby Brown Gave Her Before She Shaved Her Head|publisher=www.vogue.com|year=2017|access-date=7. november 2017|archiveurl=https://web.archive.org/web/20180101210406/https://www.vogue.com/article/stranger-things-linnea-berthelsen-kali-eight-shaved-head-purple-hair-millie-bobby-brown-netflix|archivedate=1. januar 2018}}</ref><ref name="holly"/>
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