The 100 is filled with some wonderful talent. See who plays whom!
The Main Cast
Eliza Taylor (10.24.89 Melbourne, Australia) as Clarke Griffin
Bob Morley (12.20.1984 Kyneton, Australia) as Bellamy Blake
Marie Avgeropoulos (6.18.1986 Thunder Bay, Ontario, Canada) as Octavia Blake
Paige Turco (5.17.1965 Springfield, Massachusetts) as Abby Griffin
Lindsey Morgan (2.27.1990 Houston, Texas) as Raven Reyes
Richard Harmon (8.18.1991 Mississauga, Canada) as John Murphy
Tasya Teles (2.1.1985 Toronto, Ontario, Canada) as Echo
Shannon Kook (2.9.1987 Johannesburg,
South Africa) as Jordan Green
JR Bourne (4.8.1970 Toronto, Ontario,
Canada) as Russell Lightborne
Shelby Flannery as Hope Diyoza 
Chuku Modu (6.19.1990 London, England) as
Dr. Gabriel Santiago
Former Mains
Christopher Larkin (10.2.1987 Daegu, South Korea) as Monty Green
Henry Ian Cusick (4.17.1967, Trujillo, Peru) as Marcus Kane
Isaiah Washington (8.3.1963 Houston, Texas) as Thelonious Jaha
Devon Bostick (11.13.1991 Toronto, Ontario, Canada) as Jasper Jordan
Zach McGowan (5.5.1981 New York, New York) as Roan
Ricky Whittle (12.31.81 Oldham, England) as Lincoln
Thomas McDonell (5.2.1986 Manhatten, New York, New York) as Finn Collins