<Li> "Poisonous Spider" by Company </Li> <P> In its original American broadcast, "No Exit" was watched by 2.03 million; down by 0.13 from the previous episode . </P> <P> "No Exit" received mixed to negative reviews with many hoping that now that Katherine's secret was revealed, the show will "kick in". </P> <P> Carrie Raisler from The A.V. Club gave a B rate to the episode saying that it was a filler episode: "this path to realization (finding out that Katherine is in Elena's body) basically creates a filler episode, a way to move the story to the place it needs to be for the inevitable big confrontation in the future (...) Katherine taking over Elena's life was an incredibly inspired storyline, and watching it unfold has been delightful, but sooner or later, someone had to figure out what was going on . To spend an episode almost solely focused on making that happen is a good thing ." </P>

When do they find out katherine is possessing elena