A huge doorway has been created between present-day Spooksville and sixty million years ago, and dinosaurs are roaming the streets and attacking people.

When Adam and his friends stay up late one night, they see bright lights in the sky lights that look an awful lot like flying saucers! Then the next night, one of the saucers lands by the reservoir. The creatures that come out of the ship don't look like people at all. Their heads are too large and their eyes are too big and black. Worse, the want Adam and his friends to come with them for a little ride in space. In fact, the aliens insist that they...

Adam and his friends are exploring the forest near Spooksville when they come across huge blocks of ice hidden among the trees. They decide to melt one, but when they do, a strange man comes out of the ice and tries to grab them. The man has very cold hands, and his eyes aren't too warm either! Soon there are dozens of Cold People running around Spooksville freezing everyone. It seems like nothing can stop them. But Adam and his friends have an idea...

The time has come for Adam and his friends to again face Spooksville's most powerful citizen, Ms. Ann Templeton. Sally says the woman is definitely a witch, but Adam and Watch are not so certain. To find the truth, they visit her castle together. There they find both good and bad: creatures more horrible than anything they could imagine, but also magical tools that can create the most wonderful things.