Toxic

Episode Number:134 Season: 6 (Disc 5)
Original Air Date: 4/7/2009
Director: Thomas J. Wright
Written By: Steven D. Binder
Blurb: Abby joins the staff of a classified Army research project after a lead scientist goes missing, and soon suspects that nothing with the covert experiment is what it seems.
Commentary: Pauley Perrette and Sean Murray

Cast:
Mark Harmon - yes
Michael Weatherly - yes
Cote de Pablo - yes
Pauley Perrette - yes
Sean Murray - yes
Rocky Carroll - no
David McCallum - yes
Brian Dietzen - yes

Fornell and Vance get a mention, but no screen time. This episode revolved around Abby.