The network shared a trailer and October premiere date for the show Thursday. Sweetpea is a new thriller starring Fallout and Yellowjackets actress Ella Purnell as Rhiannon Lewis, "a quiet wallflower who develops a vengeful and intoxicatingly liberating taste for murder.

Ella Purnell plays a wallflower with a killer secret in the official trailer for Sky and Starz's thriller series 'Sweetpea.'

Starz just dropped a killer new trailer and key art for its upcoming dark comedy “Sweetpea,” premiering Thursday, October 10 (8pm ET/PT). The six-part series stars Ella Purnell (“Fallout,” “Yellowjackets”) as Rhiannon Lewis,

Ella Purnell is serving up murder with a smile. The "Yellowjackets" and "Fallout" actress leads Starz series "Sweetpea," which is billed as a "deviously twisted coming-of-rage story." The "Army of the Dead" alum Purnell returns to Starz after starring in another "sweet" series: The actress previously led the adaptation of Stephanie Danler's novel "Sweetbitter" at the network back in 2018.

Sky and Starz’ Sweetpea will drop October 10. The networks have also unveiled an extended second trailer for the six-part show to build buzz, which can be watched above. From Kirstie Swain, Sweetpea stars Yellowjackets’ Ella Purnell as Rhiannon Lewis,