While scouring the sewers of New York, Nick Tatopoulos discovers one of Godzilla's eggs has survived.

H.E.A.T. are called to help the Central America Republic of Costo Rojo to deal with "El Gusano Gigante", a mutant worm that is devouring untold amounts of crops.

In response to a sanitation workers' strike, a colony of petroleum-eating microbes, controlled by nanotechnology, are released to try to curb New York's garbage problem.

After Godzilla battles robotic insects, the team encounter their creator: Cameron Winter, a powerful technology mogul and an old rival of Nick's from college.

A mutant giant rat emerges from the sewers of Manhattan.

When a strange electrical creature known as the Crackler attacks seemingly random locations in Manhattan, the team investigate.

The team are called to help a rescue mission for xenobiologist Alexander Preloran, who disappeared while on a mission to explore the Leviathan, an alien spacecraft buried at the bottom of the Pacific Ocean for 65 million years.

H.E.A.T. investigates the tropical island of Santa Marta in the wake of a devastating volcanic eruption. But what they find on the island is that, due to irradiated lava, a hideously mutated ecosystem has developed, including carnivorous plants and gigantic bees.

When villages in Mexico are attacked by a strange winged creature, ornithologist and Elsie's old fiancé Lawrence Cohen calls H.E.A.T. for help.

H.E.A.T. heads for Scotland after Dr. Hugh Trevor of the Pisces Marine Research Institute claims his facility was attacked by the Loch Ness Monster.

As tension threatens to break up the H.E.A.T. team for good, major problems arise: a Giant Bat is terrorizing the countryside of Nigeria, the U.S. military has dredged the Leviathan ship from the bottom of the Pacific, and worst of all, the aliens are back.

From their secret base on Isle del Diablo, the aliens assemble their forces; H.E.A.T. desperately fights to resist.

As the aliens and their mutation allies attack Earth, H.E.A.T. escapes captivity. They battle to defeat the alien onslaught and free the mutations from their control to help humanity fight back and save the planet from conquest.

A trip to Japan to investigate a number of mysterious disappearances leads to a battle of wills between H.E.A.T. and the Japanese military, who perceive Godzilla to be a threat.

H.E.A.T. are dispatched to aid investigation into the disappearance of a search party looking for oil in Antarctica.

Godzilla is throwing infantile tantrums and H.E.A.T. are growing worried about their ability to control him.

H.E.A.T. is charged by the Pentagon to investigate the growing population of spiders near an Army base in the Canary Islands.

When Godzilla is accused of attacking New York, the military call in H.E.A.T. to help contain him. But Phillipe Roache has returned from France...with orders to terminate Godzilla.

The Techno-Sentient, an alien piece of technology, falls to Earth and begins to bond with all manner of human technology, growing to gargantuan proportions.

Acting on confidential information from Phillipe, H.E.A.T. investigate an abandoned lab in the Amazon rain forest where, 50 years before, French scientists succeeded in creating a creature made of pure DNA.