Julia Garner is an American actress. She has appeared in the films Martha Marcy May Marlene, The Perks of Being a Wallflower, Sin City: A Dame to Kill For, and We Are What We Are.

Julia Garner plays as Ruth Langmore in Dirty John.
Julia Garner is the top #1 member of the cast and appears in 30 episodes.

Connie Britton (born March 6, 1967) is an American actress. She is best known for the roles of Nikki Faber on Spin City and on Friday Night Lights as Tami Taylor. Her most notable films are Friday Night Lights and A Nightmare on Elm Street. Despite the fact that the Friday Night Lights television series is based on the film, she portrays different characters in both of them. Her character in the show is named Tami Taylor while in the film her character is named Sharon Gaines. Description above from the Wikipedia article Connie Britton, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Connie Britton plays as Abby Clark in Dirty John.
Connie Britton is the top #2 member of the cast and appears in 10 episodes.

Christian Michael Leonard Slater (born August 18, 1969) is an American actor. He made his film debut playing a leading role in the 1985 film The Legend of Billie Jean. He then played a monk's apprentice alongside Sean Connery in The Name of the Rose before gaining recognition for his breakthrough role in the cult film Heathers. In the 1990s Slater featured in many big budget films including Robin Hood: Prince of Thieves, Interview with the Vampire: The Vampire Chronicles, Broken Arrow and Hard Rain. He was also featured in the cult film True Romance. Since 2000 Slater has combined work in the film business with television, including appearances in The West Wing and Alias. Slater was married to Ryan Haddon between 2000 and 2005; they had two children together. Slater has had widely publicized brushes with the law, including being sentenced to three months in jail for assault in 1997. Description above from the Wikipedia article Christian Slater, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Christian Slater plays as Rand Ridley (voice) in Dirty John.
Christian Slater is the top #3 member of the cast and appears in 10 episodes.

Amanda Peet plays as Betty Broderick in Dirty John.
Amanda Peet is the top #4 member of the cast and appears in 8 episodes.

Eric Bana plays as John Meehan in Dirty John.
Eric Bana is the top #5 member of the cast and appears in 8 episodes.

Rachel Rye Keller (born December 25, 1992) is an American actress. She was born in Los Angeles, and grew up in Saint Paul, Minnesota. She attended the Saint Paul Conservatory for Performing Artists and graduated in 2014 from the Carnegie Mellon University. She had a recurring role in the second season of the television series Fargo. She is the female lead in the TV series Legion.

Rachel Keller plays as Samantha Porter in Dirty John.
Rachel Keller is the top #6 member of the cast and appears in 8 episodes.

Juno Violet Temple was born in London, England, into a showbiz family, the daughter of producer Amanda Temple and film director Julien Temple. She was named 'Juno' after her parents took a visit to the Grand Canyon during pregnancy, and found they were standing on a butte of Cape Final known as Juno Temple. She has English and Scottish ancestry.

Juno Temple plays as Lucy Savage in Dirty John.
Juno Temple is the top #7 member of the cast and appears in 6 episodes.