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. Now, Purnell is both the lead star and executive producer of “Sweetpea,” another novel adaptation based on C.J. Skuse’s book.

The official synopsis reads: “Rhiannon Lewis (Purnell) doesn’t make much of an impression — people walk past her in the street without a second glance. She’s continually overlooked for a promotion at work, the guy she likes won’t commit, and her dad is really, really sick. Then everything in her life turns upside down. Rhiannon is pushed over the edge and loses control. Suddenly the wallflower is gone,...