According to TV Guide, Mystic Falls will have two more supernatural newcomers. It looks like Klaus (Joseph Morgan) has been able to keep his supply of Elena’s (Nina Dobrev) blood fresh, because he starts expanding his hybrid army. Blake Hood and Alyssa Diaz have been cast as Dean and Kimberly, Klaus’s newest creatures who show up in Season 4, Episodes 5 and 6.
It’s been far too easy for Damon (Ian Somerhalder) and Stefan (Paul Wesley) to dismantle Klaus’s hybrids by ripping their hearts out of their chest, so the OV might want to keep an extra-close watch on the newbies. Elena’s doppelganger blood is in limited supply, after all.
Source: TV Guide