Viewers are hungry for new faces on screen. That's why directors try to regularly invite up-and-coming actors who haven't yet made a name for themselves in the world of cinema to their projects. And it's a great success if a debutant turns out to be a future star with whom you can work together more than once.
Quentin Tarantino has his favorites among movie actors: Samuel L. Jackson, Uma Thurman, Tim Roth, Steve Buscemi and others. However, in this film, the "old guard" had to move over to make way for the young.
The 2019 film Once Upon a Time in Hollywood is an homage to the world capital of entertainment. The film, which glorifies the film industry of the late 60s, also tells the real story of the Charles Manson cult. Tarantino chose bright and memorable actors for the roles of the group members.

The girly trying to seduce Brad Pitt's character was played by Margaret Qualley, the star of the film Substance. And another follower of Manson, Snake, was played by Sydney Sweeney, who became famous thanks to the show Euphoria.
The images of the killers who raided the mansion were embodied on screen by Austin Butler, the star of the biographical drama Elvis, Maya Hawke, the actress from Stranger Things, and also Mikey Madison. The latter received an Oscar for Best Actress in the film Anora.
Did Tarantino suspect that with one film he would open a galaxy of stars of the generation? The question is open!