But Sweetpea protagonist Rhiannon Lewis, played by none other than Yellowjackets alum Ella Purnell, might be a rare exception. Maybe then, she would have had the chance to confront her teenage angst head-on,

Despite her upcoming murderous portrayal, Ella Purnell struggled to stomach her latest role. As the British actress discussed her homicidal character Rhiannon Lewis in Sweetpea, premiering Oct. 10 on Starz and Sky, she admitted starring in the series did “take a toll” on her mentally.

While "Sweetpea" will be a streaming exclusive, Starz also has a linear TV channel. If you don't already have Starz on cable, you can pick it up as an add-on on several live TV streaming services, including Hulu, Sling TV, Fubo, YouTube TV, Philo, and DirecTV Stream.

STARZ released a sneak peek at Sweetpea, where Ella Purnell plays a wallflower who blossoms when she starts killing people she hates.

Ella Purnell has been having a brilliant year — although maybe it would be more accurate to say a brilliant handful of years. From her terrific turn as mean-girl Jackie Taylor in Showtime's survival thriller Yellowjackets to her widely-praised voice performance in Netflix's Arcane — and who could forget her holding her own against the likes of Walton Goggins' Ghoul in the first season of Prime Video's Fallout?

Ella Purnell has talked 'Sweetpea' & drawing on experience gained from 'Yellowjackets' along with working Kirstie Swain.