Annabel Marlow trained at LAMDA, studied at the University of Leeds, and completed a Masters in Contemporary Acting at The Royal Central School of Speech and Drama. At 18, she originated the role of Katherine Howard in Six during its 2018 Edinburgh Fringe run, which later became an international theatrical hit. As a musical comedian, she came 3rd place in the UK Musical Comedy Awards 2023 and she performed the solo show '...is this okay ??' at that year's Edinburgh Fringe. In 2026, she was announced as being part of the initial cast for the UK version of Saturday Night Live.