Crossover in which the Mystery Skulls and the Wild Kratts converge to the same location by chance.
The Wild Kratts are here to study the local fauna, and stumble upon animal trafficking by chance. But something even more sinister is hiding. Some of the captured animals are not behaving as expected or naturally. The Wild Kratts' minds get fuzzy if they try to study them closely.
Not to mention that despite having a lion disc on hand, touching a tuft from a lion's mane doesn't let Chris transform.
They're not behaving 'naturally' because the poachers have a secret about their operations.
The Mystery Skulls followed rumors about poachers - the same ones! - using the cover of 'mundane' animal trafficking to smuggle captured magical animals as well as other beings like spirits into the U.S. They disguise them via magic as mundane animals:
Winged lions and griffins become 'lions'. Kelpies become 'wild horses'. Different species of hyppocampi are either disguised as horses, too, or as dolphins.
That doesn't change that many of them are animals, and are cramped with other animals in a highly stressful situation. Vivi and Mystery know a lot about demons and spirits, but they also expected to only deal with that. They, and by the extension the entirety of the Mystery Skulls, are thrown for a loop when they expect to deal with griffins, and there are real lions in the cages.
Also, every capture? Absolutely stressed to the nine.
And I haven't even gotten to each group's reaction to the existence of magic / science-fiction level of transformation devices. Or how the poachers operate, and how they're even able to camouflage with magic, or why they're doing this.
