<Table> <Tr> <Th_colspan="2"> "Klaus" </Th> </Tr> <Tr> <Td_colspan="2"> The Vampire Diaries episode </Td> </Tr> <Tr> <Th> Episode no . </Th> <Td> Season 2 Episode 19 </Td> </Tr> <Tr> <Th> Directed by </Th> <Td> Joshua Butler </Td> </Tr> <Tr> <Th> Written by </Th> <Td> Kevin Williamson Julie Plec </Td> </Tr> <Tr> <Th> Production code </Th> <Td> 2J5269 </Td> </Tr> <Tr> <Th> Original air date </Th> <Td> April 21, 2011 </Td> </Tr> <Tr> <Th_colspan="2"> Guest appearance (s) </Th> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> Daniel Gillies (Elijah Mikaelson) </Li> <Li> Joseph Morgan (Klaus Mikaelson) </Li> <Li> Trent Ford (Trevor) </Li> <Li> Dawn Olivieri (Andie Star) </Li> <Li> Lisa Tucker (Greta Martin) </Li> <Li> Gino Anthony Pesi (Maddox) </Li> </Ul> </Td> </Tr> <Tr> <Th_colspan="2"> Episode chronology </Th> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Td> ← Previous "The Last Dance" </Td> <Td> Next → "The Last Day" </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td_colspan="2"> The Vampire Diaries (season 2) List of The Vampire Diaries episodes </Td> </Tr> </Table> <Tr> <Th_colspan="2"> "Klaus" </Th> </Tr>

When does klaus mikaelson appear in the vampire diaries