Walton Sanders Goggins, Jr. (born November 10, 1971) is an American actor best known for his roles on the FX Networks series The Shield and Justified, portraying Detective Shane Vendrell and Boyd Crowder, respectively. He is also known for his character roles in the films Miracle at St. Anna and Predators. Goggins co-produced and starred in the 2001 short film The Accountant, which won an Academy Award for Best Live Action Short Film. Goggins accepted the award alongside Ray McKinnon and Lisa Blount.

Walton Goggins plays as The Ghoul, Cooper Howard in Fallout.
Walton Goggins is the top #1 member of the cast and appears in 8 episodes.

Ella Purnell (born 17 September 1996) is an English actress. She began her career as a child actress on the West End and in the film Never Let Me Go (2010).  Purnell used to attend weekly classes at Sylvia Young Theatre School, studying acting, singing and dance. Description above from Purnell's page on Wikipedia, The Free Encyclopedia

Ella Purnell plays as Lucy MacLean in Fallout.
Ella Purnell is the top #2 member of the cast and appears in 8 episodes.

Aaron Moten plays as Maximus in Fallout.
Aaron Moten is the top #3 member of the cast and appears in 8 episodes.

Kyle Merritt MacLachlan (born February 22, 1959) is an American actor. MacLachlan widely known for his portrayal of Dale Cooper in the TV series Twin Peaks (1990–1991; 2017), and its prequel film Twin Peaks: Fire Walk with Me (1992). He is also known for his film roles including cult films such as Dune (1984), Blue Velvet (1986), The Hidden (1987), and Showgirls (1995). He has also had prominent roles in other television shows including appearing as Trey MacDougal in Sex and the City (2000–2002), Orson Hodge in Desperate Housewives (2006–2012), The Captain in How I Met Your Mother (2010–2014), the Mayor of Portland in Portlandia (2011–2018), and as Calvin Zabo in Agents of S.H.I.E.L.D. (2014–2015). MacLachlan was born in Yakima, Washington. His mother, Catherine (née Stone), was a public relations director, and his father, Kent Alan MacLachlan, was a stockbroker and lawyer. He has Scottish, Cornish and German ancestry. He has two younger brothers named Craig and Kent, both of whom live in the Pacific Northwest. MacLachlan graduated from Eisenhower High School in 1977. He graduated from the University of Washington in 1982 and, shortly afterward, moved to Hollywood, California to pursue his career.

Kyle MacLachlan plays as Overseer Hank MacLean in Fallout.
Kyle MacLachlan is the top #4 member of the cast and appears in 8 episodes.

Moisés Arias (born April 18, 1994, ht. 5'1"), is an American actor best known for his roles as Rico in the Disney Channel series Hannah Montana, Biaggio in the 2013 Sundance film The Kings of Summer, Cokestraw in the 2019 SXSW comedy-drama The Wall of Mexico, and Bigfoot in the Colombian war drama Monos. He has also appeared in Pitch Perfect 3, Five Feet Apart, Ender's Game, The Stanford Prison Experiment, Jockey, The Perfect Game and The King of Staten Island.

Moisés Arias plays as Norman 'Norm' MacLean in Fallout.
Moisés Arias is the top #5 member of the cast and appears in 8 episodes.

Xelia Mendes-Jones plays as Dane in Fallout.
Xelia Mendes-Jones is the top #6 member of the cast and appears in 8 episodes.