"The Butterfly Effect Part 2" was episode 2 in season 4 of Ugly Betty, and it aired on October 16, 2009 with Kristen Johnston as a guest star.
Season 4
Episode 2 October 16, 2009 In an interview with TV Guide, creator Silvio Horta admitted that Paula Abdul was to guest star in this episode, but the show went with Kristen Johnston instead. 
