Calling all monsters, ghosts, and ghouls - class is in session! Mattel has released a bunch of new Monster High dolls and sets, and some that we've included in this list will be coming out later in the year and are up for pre-order right now. There are seasonal sets (such as the Valentine's Day-themed couple sets), as well as updated versions of the most classic Monster High characters, like Draculaura and Clawdeen Wolf. Some of these dolls are limited edition and won't be around forever, so you'll want to get your hands on them while you still can!