Nikita Season 1 Episode 7 (Nikita s01e07) with title “The Recruit” aired on Thursday, October 28th 2010 at 09:00 pm via CW Network.
Here is summary for Nikita Season 1 Episode 7 :

Alex informs Nikita that one of the recruits has been activated to carry out a suicide mission. Nikita intercepts the recruit just as Michael arrives, and the two sides exchange gunfire. Meanwhile, back inside the walls of Division, another recruit decides to attack several guards, creating mass chaos.