<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> <Li> Daniel Gillies (Elijah Mikaelson) </Li> <Li> Joseph Morgan (Klaus Mikaelson) </Li> <Li> Trent Ford (Trevor) </Li>

When does klaus first appear in the vampire diaries