‘We Were Liars’ Season 2 Reveals Its New Cast and the Sinclairs Are Getting a 1999 Origin Story

Prime Video’s breakout mystery drama made quite an entrance when it first arrived in the summer of 2025. The series, an adaptation of E. Lockhart’s bestselling novel, shot straight to the number one spot on Prime Video both in the United States and globally within days of its debut, cementing itself as one of the streamer’s most talked-about arrivals of the year.

With its story of a wealthy teen navigating amnesia and buried secrets on her family’s private island, the show drew immediate comparisons to prestige titles like ‘Big Little Lies’, and audiences were clearly hungry for more.

The series was officially renewed for a second season in September 2025, and the creative team wasted little time laying the groundwork for what comes next. Co-showrunners Julie Plec and Carina Adly MacKenzie are back at the helm, with the novel’s author E. Lockhart also returning as an executive producer. The season will draw from Lockhart’s 2022 prequel novel ‘Family of Liars’, which has had fans speculating about flashback timelines and hidden Sinclair history ever since the renewal was confirmed.

Now Prime Video has officially revealed who will be bringing that history to life. Josh Dallas, Costa D’Angelo, Parker Lapaine, Peyton List, Elysia Roorbach, and Madison Wolfe have all been cast as series regulars for the second season. The announcement, shared by the @PrimeVideo account on X, teased the new cast with the line “They were always a family of liars. Carrie. Penny. Bess. Meet the new cast of We Were Liars Season 2,” and included a dramatic clip already prompting fan reactions across social media.

The season flashes back to the summer of 1999, with the new additions playing younger versions of the Sinclair family’s core adults. Josh Dallas, best known for ‘Manifest’ and ‘Once Upon a Time’, steps into the role of a young Harris Sinclair, the family patriarch previously played by David Morse, while Peyton List, known for her role in ‘Mad Men’, takes on a young Tipper. Caitlin FitzGerald’s Penny will be played in the 1999 flashbacks by Elysia Roorbach, while Mamie Gummer’s Carrie gets a younger counterpart in Parker Lapaine, and Madison Wolfe steps in as the teenage version of Candice King’s Bess.

Lockhart herself teased that while the prequel storyline will explore the Sinclair sisters as teenagers, fans will still see Cadence, Johnny, and the adult sisters in the new season as well. That means Emily Alyn Lind is returning as the series’ narrator, giving the season a dual-timeline structure that could finally answer some of the deeper questions Season 1 left hanging. The new addition of Costa D’Angelo rounds out the cast as Pfeff, a New England college student described by Prime Video as soulful, observant, and wounded.

For a series built entirely on the idea that every perfect family is hiding something, returning to 1999 to watch the Sinclair parents live out their own secrets feels like a natural and genuinely exciting expansion of the world. Co-creators Plec and MacKenzie have previously said there are still plenty of secrets buried on Beechwood Island, and that they cannot wait to keep digging them up. With a stacked new ensemble and a prequel story that even book readers will find surprising, Season 2 already has a lot to live up to and a lot of promise to back it up.

Let us know in the comments whether you are excited to see the Sinclairs’ origin story unfold, and which new cast member you think is the most inspired piece of casting.