Wikimedia Commons/Sweetpea TV series Celebrity From Fallout's Lucy to a murderous wallflower. Ella Purnell returns in Sweetpea S2, the dark comedy thriller with an 88% Rotten Tomatoes score. April 18, 2026 AceShowbiz - Ella Purnell is back in a sinister new role for the highly anticipated second season of Sweetpea, the dark comedy thriller streaming on Starz. Known most recently for her portrayal of Lucy in Prime Video's Fallout, Purnell takes on a chilling transformation as Rhiannon, a once-overlooked wallflower who becomes a murderous presence in this gripping British series.