CSI: Crime Scene Investigation profiles the original cast members of the crime drama television series. It introduces Gil Grissom, the entomologist and lead CSI who left after season 8, as well as Warrick Brown, Catherine Willows, Nick Stokes, Greg Sanders, Sara Sidle, and Dr. Al Robbins. It provides brief biographical details and career histories for each cast member.

1. CSI: Crime Scene Investigation

2. CSI Original Cast From Left to Right: Det. Jim Brass, Dr. Al Robbins, Warrick Brown, Gil Grissom, Sara Sidle, Catherine Willows, Nick Stokes, Greg Sanders

3. Gil Grissom Entomologist Lead CSI Left the show in the 8th season to go on sabatical Came back and left the show for good in the 9th season

4. Warrick Brown Has gambling problem Got new partner killed in first episode Got married and had a son Part of the original cast: left in the end of season 8

5. Catherine Willows Former Exotic Dancer Has one child named lindsey Divorced Took over as lead CSI when Grissom left

6. Nick Stokes Held hostage in his apartment by the cable guy Held at gun point Trapped in a coffin

7. Greg Sanders Formerly a lab tech Made a CSI by Grissom

8. Sara Sidle Married to Gil Grissom Brought in by Grissom to replace Warricks old partner Left to do research in the jungle

9. Dr. Ray Langston Former professor at UNLV First level CSI Wants to be the best CSI he can be