This week's entry of the CW's The Vampire Diaries is called "Ghost World." Damon (Ian Somerhalder) is surprised to be attacked by Mason Lockwood (Taylor Kinney), whom he killed. Then other ghosts begin showing up. Elena (Nina Dobrev) is pleased to see Lexi (Arielle Kebbel), who agrees to help Elena try to get through to Stefan (Paul Wesley). Stefan is still out of touch with his humanity, thanks to Klaus (Joseph Morgan). The deceased tomb vampires terrorize the town again. Bonnie (Kat Graham) is jealous of Jeremy's (Steven R. McQueen) closeness to his dead ex, Anna (Malese Jow). Luckily, Bonnie's grandmother, Sheila (Jasmine Guy), returns to help her send the ghosts, including the tomb vampires, Mason, Lexi, and Anna, back to the other side.
"Ghost World" is thrilling because a number of characters fans think they may never seen again pop back up. Anna has been around for a handful of episodes now, but seeing Lexi, Mason, Sheila, and others is a fun diversion. The notable absence from all of this crazy is Jenna (Sara Canning). Not that there isn't enough going on already, but it would be nice if she appeared, considering how Elena, Jeremy, and Alaric (Matthew Davis) are still struggling to cope with her loss.
Mason is the most surprising of the ghosts who invade Mystic Falls. When last seen, Mason is kind of a bad guy. But death changes him, making him realize what is really important in life. This time, Mason's biggest concern is helping his nephew, Tyler (Michael Trevino), who is Klaus's new hybrid vampire / werewolf. As such, Mason is able to put aside his differences with Damon, as he realizes that Damon is his best shot at taking out Klaus, thus freeing Tyler from very negative influence.
Damon continues to struggle with whether he can be good or not. With Stefan going evil, there is a vacuum of positive vampire influence in town. Damon resists filling that gap, and yet, cannot help doing so to some extent. He's not warm and cuddly, barely apologizing to Mason for killing him, and only because he is forced to. But his friendship with Alaric, well on the way to a true bromance, feels more real, even if Damon won't verbally express his feelings. And, of course, he has true affection for Elena, which motivates him into helping her whenever possible.