CSI/The Descent of Man
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The Descent of Man is the nineteenth episode of the ninth season of CSI, and the two hundred first episode overall.
Starring: William L. Petersen (Gilbert "Gil" Grissom), Laurence Fishburne (Raymond "Ray" Langston), Marg Helgenberger (Catherine Willows), Gary Dourdan (Warrick Brown), George Eads (Nicholas "Nick" Stokes), Jorja Fox (Sara Sidle), Eric Szmanda (Gregory "Greg" Sanders), Robert David Hall (Dr. Albert "Al" Robbins), Wallace Langham (David Hodges), Lauren Lee Smith (Riley Adams), Liz Vassey (Wendy Simms), David Berman (David Phillips), Paul Guilfoyle (Capt. James "Jim" Brass)