Title: 'Convergence' (Episode #20)
Airing: Friday, November 11, 2005 on CBS
Synopsis: When a father is killed in a home invasion, Don and his team investigate the connection between the murder and a rash of robberies in the upscale community.

Colin will play 'Marshall Penfield', a math rival of Charlie's who comes to basically rip apart five years of Charlie's work -- the Eppes Convergence -- the math theorem that made Charlie famous and gave him tenure at Cal Sci. He has to prove his mettle as a mathematician.