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.
Casts:
Jennifer Garner, Michael Vartan, Victor Garber, Ron Rifkin, Carl Lumbly, Kevin Weisman, Rachel Nichols, Amy Acker