Community Season 2 Episode 21 can be watched on Thursday on April 22, 2011 at 8:00pm EDT on WNBC (NBC) TV channel. Title of the brand new episode is: Paradigms of Human Memory. Synopsis of the episode is: Members of the study group think back on their favorite times together; Troy's pet monkey reappears briefly before escaping into the ventilation system, followed by Senor Chang.
