<P> Damon wakes up chained on the Salvatore house 's basement . Stefan is there and Damon tries to warn him that because of his cravings , one day he will kill him but Stefan tells him that they will find a solution . Damon points to Stefan that `` Elena '' provoked him to feed on her and then she kicked a stake towards him so he will kill him . Stefan does not believe that Elena would want that , he locks Damon up and gets upstairs where Caroline is . The two of them discuss what happened between Stefan and `` Elena '' and Caroline also tells him about Nadia and Matt and the text he sent to her . From Matt 's text , who used `` K '' and not `` E '' , they put the pieces together and they realize that Katherine is in Elena 's body . </P>
when does everyone find out katherine is in elenas body
Caroline also tells him about Nadia and Matt and the text he sent to her . From Matt 's text , who used `` K '' and not `` E