Season 4

Chris and Martin are determined to prove to Aviva that there's more to crocodiles than their reputation as scary brutes. They use an egg disguise, created by Aviva, to infiltrate a crocodile nest for an insider's look at the challenging journey of the infant crocs and their mom. Science Concept: Heat can be produced in many ways, and can move from one object to another by a process called conduction.

Chris and Martin are taking Aviva's sub prototype out for a test drive when it gets sucked into a battle between a Sperm whale and Giant squid, spiraling down into the depths. The brothers want to follow, but their damaged sub can't take that kind of pressure. Aviva develops whale and squid Creature Power Suits, so the brothers can go where no sub has gone before. Science Concept: Pressure is force applied to an area.

When a young aardvark accidentally becomes a stowaway in Chris's backpack, the Wild Kratts team sets off on a "door to door" search to return him to his home burrow. Along the way, they discover the incredible (and valuable) service the aardvark provides to all the burrow-living creatures of Africa. Science Concept: Aardvarks manipulate earth materials and alter landscapes.

While on a mission to discover the secret of the Draco lizard's gliding abilities, Martin and Chris uncover an evil plot by fashion designer, Donita Donata. She has been capturing these amazing creatures with a plan to make them part of her new Fall collection. It's the Wild Kratts team to the rescue! Science Concept: Gliding, Gravity.

Aviva miniaturizes Chris and Martin for an underground mission with earthworms, in search of the answer to the mystery "Why do worms come above ground when it rains?" But they have to hurry, as they soon discover that life as a worm is full of dangers at every turn. Science Concept: Wet objects can be changed by heating and cooling. If a worm is left in the hot sun, their skin will dry up and they will die. Worms need to stay wet and their environment helps keep them that way.

While kayaking in Australia, Martin and Chris encounter one of the world's most unusual creatures, a platypus mother with her eggs. But unscrupulous endangered animal chef, Gourmand, plans on making the platypus eggs his next delicacy. The Wild Kratts team must use the special "sixth sense" of the platypus to save the eggs. Science Concept: Organisms use their senses to find out about their surroundings and themselves. Different senses give different information. Platypus have a special electromagnetic sense that detects objects, like food.