United Kingdom, May 16 -- Ryan Kiera Armstrong is set to star in the 'Buffy the Vampire Slayer' reboot.

The 15-year-old actress has landed the lead role opposite Sarah Michelle Gellar, who played Buffy Summers in the original TV series.

Sarah, 48, wrote on Instagram: "I want to introduce you to @ryankarmstrong From the moment I saw Ryan's audition, I knew there was only one girl that I wanted by my side. To have that kind of emotional intelligence, and talent, at such a young age is truly a gift. The bonus is that her smile lights up even the darkest room. Welcome to #NewSunnydale #btvs (sic)"

Ryan will play the new slayer in the Chloe Zhao-directed pilot. The actress' character has been described as an introverted high-school student....