'Operation: Sleeper' by Brian K. Vaughan

Jack learns from Juliet that she is still working for Ben...

Matthew Fox (Doctor Jack Shephard), Elizabeth Mitchell (Juliet Burke)

Directed by Jack Bender
Produced by Ra'uf Glasgow and Pat Churchill
Executive Producers J.J. Abrams, Damon Lindelof, Bryan Burk, Jack Bender and Carlton Cuse

TX (US):
3rd December 2007 (Verizon); 10th December 2007 (abc.com)

Notes:
*Featuring Jack and Juliet