See How the Stars of Once Upon a Time in Hollywood Compare to the Real-Life Players

The I, Tonya actress reunites with her The Wolf of Wall Street co-star to play the ill-fated actress who was eight-and-a-half months pregnant with husband and film director Roman Polanski‘s baby when she was murdered by the Charles Manson Family in the summer of 1969. 

The Into the Wild actor plays celebrity hair stylist and Tate’s ex-boyfriend, born Thomas Krummer, who was murdered alongside her and couple Wojciech Frykowski and Abigail Folger on August 8, 1969.

The Australian actor, perhaps best known for playing Dewey Crowe in 22 episodes of FX’s Justified, plays the notorious cult leader and murderer who died in late 2017 from cardiac arrest resulting from respiratory failure and colon cancer at the age of 83.

Butler, who has dated Vanessa Hudgens for eight years and just landed the highly-coveted role of Elvis Presley in Baz Luhrmann‘s upcoming biopic, stars as the central member of the Manson Family, responsible for carrying out seven murders, including Tate and Sebring’s. 

The Girls creator and star portrays one of Manson’s followers who did not participate in the Tate-LaBianca murders

The legendary actor plays the aged rancher who was convinced by Manson to allow the Family to live on his Los Angeles ranch, which used to be a filming location for Westerns. Burt Reynolds was initially cast in the role, but died before his scenes could be filmed.

The War of the Worlds star plays this member of the Manson Family who earned her nickname from Spahn because of the sound she made when he touched her. While she didn’t take part in the Tate-LaBianca murders, she would go on to make an assassination attempt on President Gerald Ford in 1975.

The Justified star plays this actor, born Maurice William Elias, who was best known for starring in the late ’60s TV western Lancer. In 1973, Stacy was hit by a drunk driver while driving his motorcycle, resulting in the amputation of his left leg and arm, as well as the death of his girlfriend Claire Cox.

In what would turn out to be his final film role, the late Riverdale actor, who died tragically in early March after suffering a massive stroke at his home on February 27, 2019, plays this Canadian-born actor who starred on Lancer alongside Stacy. 

The Empire actor appears as the legendary kung-fu master, whom Polanski briefly believed might’ve been behind the murders of Tate and the others at his home.

The star of Hulu’s upcoming Four Weddings and a Funeral series adaptation from Mindy Kaling appears as the Mamas and the Papas singer.

The Haunting of Hill House actress appears as this member of the Manson Family who joined the four behind the Tate murders the following evening to murder Leno and Rosemary LaBianca in their home.

Beaty appears as Katie, the nickname given to Patricia Krenwinkel, the Manson Family member who directly participated in the Tate-LaBianca murders. Coincidentally, she also played Krenwinkel in NBC’s Manson-centric series Aquarius that ran for two seasons from 2015-16.

The Atypical actress appears as the Mamas and the Papas singer who would die in her sleep at age 32 in 1974.

The Polish actor makes his English-language film debut as the famous director married to Tate at the time of her murder who would go on to become a fugitive from the U.S. criminal justice system in 1978 after fleeing the country while awaiting sentencing after pleading guilty to statutory rape.

The Billions star makes a cameo as the actor nicknamed “The King of Cool” who starred in hit films like The Thomas Crown Affair, The Magnificent Seven and The Towering Inferno.

The star of The Leftovers appears as this Manson Family member, nicknamed Kitty, who was the girlfriend of Bobby Beausoleil, the man convicted of killing fellow Manson Family member Gary Hinman.

The Don’t Trust the B star makes a cameo as the popular actress and singer who was married to James Stacy at the time.

The Stranger Things actor appears as the Manson Family member who killed Spahn ranch hand Donald “Shorty” Shea weeks after the Tate-LaBianca murders. He remains the only person in the Family to be released from prison after being convicted of murder, having been granted parole in 1985.

The Masked Singer competitor makes a cameo as the British actress who had lunch with Tate on the day she was murdered.

The Better Things actress plays one of the Manson Family member who directly participated in the Tate-LaBianca murders.

The Russian actor, best known for recurring as Oleg on The Americans, plays the Polish actor who was killed alongside Tate in Polanski’s home.

The Sound of Music actor—he played Friedrich von Trapp in the classic film—appears as this actor-turned-TV director.

Though he never made it in the film, the Westworld actor was cast as the iconic actor who was due to appear in the film as well until his death forced director Quentin Tarantino to recast him with Dern. While it’s unclear whether Marsden ever filmed his intended scenes, he gets a “special thanks” in the film’s credits.

Similarly, Gilmore Girls actor and Empire co-creator Danny Strong was cast as the legendary Rat Pack member who starred in The Wrecking Crew with Tate, only to find himself cut from the film as well.