<Tr> <Th> 19 </Th> <Td> "Us or Them" </Td> <Td> Milan Cheylov </Td> <Td> David H. Goodman </Td> <Td> May 2, 2011 (2011 - 05 - 02) (NBC) </Td> <Td> 4.14 </Td> </Tr> <Tr> <Td_colspan="6"> Vice President Jarvis has just been sworn in as acting president as Martinez lapses into a coma and his condition worsens . Meanwhile, Sean and Vicky board a plane headed back for the U.S. with the hopes of catching the virus but they arrive too late . Sterling is fired by Jarvis for questioning Jarvis' involvement with poisoning Martinez . Elsewhere, Michael helps Simon and Leila escape from the sleeper compound . Michael is killed while trying to protect Leila and Simon . Before dying, Michael gives Simon an antidote with the hopes it will cure Martinez . Simon escapes while Leila watches Michael die as Sophia and her troops arrive at the scene . </Td> </Tr> <Tr> <Th> 20 </Th> <Td> "One Will Live, One Will Die" </Td> <Td> Alex Zakrzewski </Td> <Td> David Schulner </Td> <Td> May 9, 2011 (2011 - 05 - 09) (NBC) </Td> <Td> 3.85 </Td> </Tr> <Tr> <Td_colspan="6"> Sean and Vicky are able to prevent the sleepers from releasing the virus into the air circulation system of a mall . However, one of the sleepers escapes and unleashes a portion of the virus onto a bus as a test of its virulence . From a video of the bus passengers' deaths, Sophia concludes that the virus kills humans too quickly, which would mean that it would be contained before it could spread across the world . As Sophia's people are completely immune, a hybrid - Leila - will be used to incubate a mutated strain . Meanwhile, Lee seeks Sterling's help to get the antidote to President Martinez . Jarvis sends men to stop them, but they escape . Hearing that Sterling contacted Christina, Jarvis tells the First Lady that Sterling poisoned her husband . Apparently convinced, Christina says that she was asked to meet Sterling and Lee secretly at an empty warehouse . Jarvis arranges for the warehouse to be destroyed with Sterling and Lee inside, ignoring the strong protests of his advisors . His men search the wreckage but find the targets have escaped through an underground tunnel . Christina injects the antidote into her husband, after discreetly receiving it from a disguised Lee at the hospital gift shop . </Td> </Tr>

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