Episode 29 of "Alias"
s02e07 The Counteragent
Title: The Counteragent
Original Air Date: 11/17/2002 on ABC
Director: Daniel Attias
Writer: John Eisendrath
Guest Stars: Chris Ellis (CIA Agent Chapma), Jim Hanna (Claus Richter), Victor McCay (CIA Agent Rudman), Stephen Davies (Sark associate), Ivan Borodin (Lab Technician), Mak Takano (Ryokan Guard), Stephen Mendillo (Henry Fields), Reamy Hall (Nurse #2), Peggy Goss (Attending Nurse), Michelle Arthur (Abigail), Joel Guggenheim (Agent-on-call), Petra Wright (Alice)
Plot Outline:
Sydney races to find a cure for Vaughn, but in order to find the antidote, Sydney must make a deal with Sark that could endanger Sloane's life. Meanwhile, Will continues his research for Vaughn and discovers some disturbing inconsistencies involving 20-year-old standardized IQ tests.