Jack and Annie travel in their magic tree house to the land of the mystical selkies to seek a magical sword for Merlin.

The animated gang of teen monsters travel centuries into the past to the first day ever at Monster High, but when they return they have each merged with another in the group creating freaky hybrid monsters all around. I’m not sure, but I’m betting that Mattel used this DVD release as an opportunity to also sell freaky hybrid fashion dolls.