• Season four of the Netflix thriller "You" dropped part one on Thursday.

• Penn Badgley returned as protagonist Joe, alongside Tati Gabrielle as Marienne.

• Charlotte Ritchie, Lukas Gage, and Tilly Keeper are all new additions to the cast.

Penn Badgley reprises his leading role of Joe on season four.

The fourth season of Netflix's thriller series "You," which is based on Caroline Kepnes novels, will include both new and returning actors.

Badgley has played the villainous protagonist Joe since the show premiered in 2018, and he reprises the role on season four.

Before his turn on "You," the actor was known for playing Dan Humphrey on The CW's "Gossip Girl."

He also was in films like "John Tucker Must Die" (2006) and "Easy A" (2010).

Tati Gabrielle returns as librarian Marienne, Joe's latest obsession.

Netflix watchers may recognize Gabrielle as Prudence Night from "Chilling Adventures of Sabrina." She was also on The CW's "The 100."

Recently, she appeared in the action flick "Uncharted" (2022), alongside Tom Holland.

A new cast member, Charlotte Ritchie plays Kate — a smart, yet icy art-gallery director.

Known for her role as Alison on BBC's "Ghosts," Ritchie has appeared on other shows like BBC's "Call the Midwife," Channel 4's "Fresh Meat," and ITV's "Grantchester."

Netflix fans may also recognize Ritchie from the streaming network's series "Feel Good."

Lukas Gage plays an American expat in London named Adam.

HBO viewers may recognize Gage from the popular shows "The White Lotus" and "Euphoria."

The actor also was on Hulu's "Love, Victor" and Netflix's satire comedy "American Vandal."

Tilly Keeper plays Lady Phoebe, Adam's girlfriend and a socialite with a massive fan base.

The actress played Louise Mitchell on the BBC soap opera "EastEnders."

She also appeared in the TV movie "Make Me Famous" (2021).

Aidan Cheng appears as Simon, a wealthy artist and son of a tech entrepreneur.

Cheng has appeared on several television shows, including Hulu's "Harlots" and Starz's "The Girlfriend Experience."

Additionally, he played Carl Wong on season two of Sky Atlantic's thriller "Devils."

Amy-Leigh Hickman joins the cast as Nadia, a literature major and an aspiring author.

Another "EastEnders" alum, Hickman started her TV career as Carmen Howle on the CBBC series "Tracy Beaker Returns."

She later reprised that role on several sequel series, like "The Tracy Beaker Survival Files" and "The Dumping Ground Survival Files."

She's also known for her turn on Channel 4's "Ackley Bridge."

Ed Speleers plays Rhys, a successful memoir author turned politician.

Speelers notably played James "Jimmy" Kent on the hit ITV series "Downton Abbey," though viewers may also recognize him as Stephen on Starz's "Outlander."

He's also known for playing the title character in the 2006 film "Eragon."

Stephen Hagan plays Malcolm, a literature professor with a penchant for life's luxuries.

Hagan is known for playing Rich Clayton on  Sky 1's "Lucky Man."

He also has appeared on shows like ITV's "The Larkins" and BBC's "The Cut," plus in the Hallmark holiday movie "A Royal Christmas" (2014).

Dario Coates appears as Connie, a member of Kate and Phoebe's Oxford clique.

Coates took a turn on ITV's "Coronation Street," the longest-running British soap opera.

Additionally, he appeared on the Hulu series "Rules of the Game."

Sean Pertwee plays Vic — Adam's driver, dealer, and security guard.

Pertwee has had a long career in film and television.

He is well-known for his turn in the movies "Event Horizon" (1997) and "Dog Soldiers" (2002), as well as on shows like CBS' "Elementary" and Fox's "Gotham."

Alison Pargeter plays paparazzi photographer Dawn.

Like some of her costars, Pargeter appeared on "EastEnders."

She also was on the HBO shows "Chernobyl" and "The Nevers," as well as Starz's "Outlander".

Ben Wiggins plays Roald, a stylish member of an aristocratic family with a dark side.

Wiggins is known for playing Nick in the 2017 film "Anna and the Apocalypse."

He also appeared in the 2018 movie "Mary Queen of Scots" and on the Epix/HBO Max series "Pennyworth."

Fans of Netflix's "The Witcher" may also recognize Wiggins as "the Adonis" from season one.

And recently, he played Carl on Netflix's Neil Gaiman adaptation "The Sandman."

Adam James takes on the role of Elliot, a California hitman whose job brings him to Europe.

An experienced actor, James has been in many films and television shows.

Fans may recognize him from BBC's "Vigil," HBO's "I May Destroy You," Epix's "Belgravia," or Britbox's "Hotel Portofino."

He's also appeared in films like "Johnny English Strikes Again" (2018) and "The Kill Team" (2019).

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