Voyage of the Butterflier XT.After being challenged by Aviva, Chris and Martin shrink down to the size of a monarch butterfly, and travel with a butterfly named Maxilla on her annual migration to Mexico, flying over 3,000 miles of land and sea. But the plan is complicated when Donita plans on stealing all the butterflies to launch a new line of butterfly barrettes. After she gets away with most of the butterflies while Chris and Martin are hibernating, the brothers activate their creature power suits to stop her, only to discover a shocking secret about the monarch butterflies that will change their entire worldview.