<Tr> <Th_colspan="2"> Guest appearance (s) </Th> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> Olga Fonda (Nadia) </Li> <Li> Michael Malarkey (Enzo) </Li> <Li> Rick Cosnett (Wes Maxfield) </Li> </Ul> </Td> </Tr> <Ul> <Li> Olga Fonda (Nadia) </Li> <Li> Michael Malarkey (Enzo) </Li> <Li> Rick Cosnett (Wes Maxfield) </Li> </Ul> <Li> Olga Fonda (Nadia) </Li>

When do they find out its katherine in elena's body