Netflix’s ‘Sirens’: Milly Alcock Reportedly Cast—Everything We Know

The tidal buzz around Sirens on Netflix keeps swelling as audiences dive into Milly Alcock’s first major role since House of the Dragon. Dropping all five episodes globally on 22 May 2025, the dark comedy-thriller has surged into Netflix’s Top 10 and ignited debate about ambition, wealth and sibling rivalry. What is Sirens about? Set on a secluded Long Island estate, Sirens follows Devon DeWitt (Meghann Fahy), a Manhattan bartender who races to rescue her younger sister Simone (Milly Alcock) from the orbit of billionaire socialite Michaela “Kiki” Rhinebeck (Julianne Moore). When Devon infiltrates Kiki’s opulent world, secrets, power plays and moral compromises surface in rapid-fire twists. Milly Alcock’s transformation Alcock sheds her Westerosi armor to play Simone, an impressionable assistant seduced by privilege. The Australian actor perfected an American accent and a poised yet brittle demeanor, explaining that Simone “wants to belong so badly she’ll ignore the warning signs until it’s almost too late.” Full cast and creative team • Julianne Moore as lifestyle mogul Kiki Rhinebeck • Meghann Fahy as fiercely loyal Devon • Milly Alcock as conflicted Simone • Kevin Bacon, Glenn Howerton, Bill Camp and Felix Solis round out the ensemble. Playwright-turned-showrunner Molly Smith Metzler (Maid) adapts her own stage drama, keeping the limited series tight at five episodes with no filler. Episode count, runtime and binge factor Sirens is a single-season miniseries: • 5 episodes • 45–55 minutes each • Total runtime: just under 4½ hours The compact length — rare for prestige TV — makes Sirens an easy weekend binge and a likely awards contender later this year. Early reviews and viewer reaction Critics praise Alcock’s “razor-sharp” performance and Moore’s “magnetic menace,” while Rotten Tomatoes posts a fresh 74 % score and IMDb users average 7/10. Social media calls the finale “a gut punch that invites rewatching to catch the clues.” Spoiler-free ending tease Without unveiling a key twist, Sirens closes by flipping the power dynamic between sisters and benefactor, asking whether survival in a gilded cage is victory or defeat. Keep an eye on Simone’s final line; Metzler hides the season’s thesis in plain sight. Filming locations Principal photography took place at Caumsett State Historic Park Preserve on Long Island, leveraging its windswept bluffs and Gatsby-era mansions to amplify the show’s themes of isolation and excess. How to watch Sirens on Netflix Sirens streams exclusively on Netflix in 190+ countries. Viewers can enable Dolby Vision HDR and 5.1 audio for the full coastal-storm ambience. A basic-with-ads plan is sufficient, though UHD subscribers get pristine visuals of Kiki’s oceanfront compound. Why Sirens is dominating search High-profile casting, a brisk episode count, and a storyline that marries Succession’s privilege critique with psychological suspense make “Sirens Netflix Milly Alcock” the breakout keyword trio of the month. Whether you’re here for Alcock’s star-making turn, Moore’s icy charisma, or just a sharp limited series to binge, Sirens earns its spot on your watch list.