A nest of invisible baby dragons has been discovered in Queen Sofia's castle, so Drake, Worm, and Val (Carlos's cousin), must journey to the dangerous Dove Island to find the parents and the fruit that ensures the dragons' invisible powers.

As a thank-you from Merlin and Morgan, Jack and Annie are sent on what should be a vacation at a luxurious resort in Cozumel, Mexico, but is, by mistake, an adventure with ancient Mayans, instead.