The Zebra Brothers kidnap Mystique Sonia and use her as bait to lure First Squad to the Eastern Citadel. Their plan works and Lin Chung and team arrive to find HighRoller has a couple of new warriors; Kangaroo and Gorilla King combine to form the outrageous fighter Gorillaroo while HighRoller combines with Bearstomp to form HighStomp. First Squad is in danger until they figure out fantastic fighting combos of their own.

After First Squad defeats the Lizards in battle, Lizard King offers to join Big Green and learn more about human behavior. Back at the base, Lin Chung quickly grows suspicious of the King’s true intentions. Turns out Lin Chung is right. While Lizard King is showing off his artistic capabilities, he literally photo-freezes everyone but Lin Chung and tries to turn them over to the TwinMasters.

When Jumpy takes a heavy dose of Chaotic Energy during a battle with TwinMasters, his imagination literally comes to life. Whenever Jumpy sleeps, the monsters he dreams up come alive. Back at Big Green Woo must come up with a solution before the creatures escape and harm innocent citizens of Hidden Kingdom.

HighRoller teams up with an evil inventor named Infinitum in yet another attempt at doing First Squad in once and for all. Turns out Infinitum is an old school mate and nemesis of Big Green’s Woo the Wise and would like nothing more than to exact revenge on the guy who got him kicked out of school for cheating. Infinitum uses Big Green’s Ground Hogs as the guinea pigs for his experiment, transforming them into hypnotized cyber-animals.

When First Squad, ApeTrully and Crocodile King travel to the far North to investigate reports of animals and humans fleeing for their lives, they come across the work of TwinMasters. The villain has resurrected a T-Rex and, along with him, a Primitive Man. A battle ensues, but when Lin Chung saves the Croc King’s life, the Primitive Man switches sides — appreciating the close relationship between man and reptile — a mirror of his relationship...

ApeTrully receives an unusual report. The Dog Pack, loyal members of Big Green, are attacking human villages. Wu Sung, the Dental Warrior, knows that his brother, the Dog King, has had difficulty leading a domesticated life and vows to stop him from causing more destruction. But when Wu Sung and First Squad arrive on the scene, things aren’t as they seem. Wu Sung realizes that the bite marks in the village square aren’t canine.

Lin Chung is on high alert. He senses chaos is poised to destroy Hidden Kingdom. And this insight could only mean one thing: TwinMasters is preparing for an ultimate attack on Big Green. Fortunately, Woo the Wise has a design that just might provide the sort of firepower the rebels need. As the Heroes of Big Green work diligently to carry out Woo’s plans, HighRoller finds that TwinMasters is undergoing a strange metamorphosis.

When ApeTrully is kidnapped by HighRoller’s minions and held prisoner in the East Citadel, First Squad must figure out a way to sneak into the heavily guarded Palace and save their commander. Lin Chung suggests that the human members of the team enter the Spirit Cave where legend has it, magical powers will turn them into animal versions of themselves - the perfect disguise. Later, a Panther, Swan and Boar gain entrance to East Citadel by presenting...

The Zebra Brothers have stolen a magical amulet from the Owl tribe. First Squad chases the bad boys down, but just as they were in reach, their turtle mounts poop out. Back at base, ApeTrully offers the turtles a much-needed break, but Mighty Ray, still infuriated, hurts their feelings. Feeling unloved the turtles leave and fall into HighRoller’s hands. He uses the Owl’s amulet to turn them into fire-breathing Mega-Turtles.

Lin Chung is on high alert. He senses chaos is poised to destroy Hidden Kingdom. And this insight could only mean one thing: TwinMasters is preparing for an ultimate attack on Big Green. Fortunately, Woo the Wise has a design that just might provide the sort of firepower the rebels need. As the Heroes of Big Green work diligently to carry out Woo’s plans, HighRoller finds that TwinMasters is undergoing a strange metamorphosis.