Jack contacts a mysterious woman, that of former KGB agent Katya Derevko, Irina's older sister, to help him free Sydney and Vaughn, whose plane has crashed inside North Korea while seeking to find a defecting Russian scientist, named Leonid Lisenker, whom Sark is trying to kill before turning himself to the CIA. But Jack is faced with a curious conundrum when Katya tells him that she will not put the rescue plan in motion until he fulfills a favor: assassinate Sloane. Written by
Did You Know?
There are three Derevko sisters: Irina, Katya and Elena. See more
When the plane is blowing up, the springboards under the Korean soldiers are clearly visible. See more
Tell me, which of Irina's sisters are you? Elena or Ekatarina?
I haven't been Ekatarina since I was a child. My sisters call me Katya. Which means Irina wasn't the one who told you about me.
Learning that your wife is actually a Russian spy drives you to learn all you can about her true identity.
Written by J.J. Abrams
Performed by Michael Giacchino See more