Prologue:
Deep below the Earth, water from the surface begins to seep into ancient caverns and begins to thaw out something that has been frozen for millennia. Freed from its frozen tombs, this ancient monster awakens and begins digging its way to freedom.

Now:
At the offices of the Daily Bugle, J. Jonah Jameson has just finished telling Peter Parker about his latest assignment: To go to the Savage Land to report on the effects of climate change in the region. He has chosen Peter to go as the photographer has been to the Savage Land in the past. Although Peter has his reservations, he is eventually talked into going by his wife, Mary Jane, as they could really use the money to pay for their schooling.

He soon finds himself on a transport to the South Pole along with a collection of other reporters and scientists. The entire expedition is overseen by SHIELD agent Chris Townsend under directions of the United Nations, who is there to makes sure that the reporters and scientists get in and out of the region safely. Although the reporters are allowed to roam freely, Townsend warns that the Savage Land is a dangerous place and they should always have a SHIELD advisor with them at all times. As he begins briefing them on the environmental reports, which Peter has already read. He thinks grimly about how climate change has been causing the glaciers around the Savage Land to thaw, threatening massive floods that will wipe out all life in the region. It will be the largest ecological disaster in human history unless the United Nations and SHIELD can do something to stop it. Soon, they arrive over the Savage Land, the sight of which still manages to take Peter's breath away. Once they land at a facility, Peter and the others are brought to a lab that is being run by the Roxxon corporation. Agent Townsend explains that Roxxon is working on building massive refrigeration units to keep the glaciers from melting further. They are then introduced to the head of the project, Doctor Gerald Roth, who thanks them all for coming and tells them that the road ahead will be a treacherous one.

Suspicious of what Roxxon is really up to, Peter Parker slips away from the group and changes into Spider-Man so he can look around unimpeded and get photos of the truth. Given his past experience in the Savage Land, the wall-crawler knows that there is only one person in all of the Savage Land who can give him the unfettered truth. At that moment, in the village of the Fall People, a triceratops is running wild. When a little girl ends up in the path of the rampaging dinosaur, Ka-Zar swoops in and rescues her from being trampled. After the dinosaur is restrained, Ka-Zar meets with Tongah, his ally to warn him that a nearby dam is about to burst. Once that happens, the entire village will be washed away and time is of the essence as the dam is scheduled to burst by nightfall. Sensing Spider-Man up in a nearby tree, Ka-Zar tells the wall-crawler he can come down. Spider-Man explains that he has heard about the problems they have been having in the Savage Land and has come to lend a hand.

Interlude:
In the caverns of Monster Island, the various monsters who live here are waiting patiently for the return of their absent master, the Mole Man. The creatures suddenly hear rumbling coming from one of the tunnels. When they see the creature that is coming their way, these monsters flee in abject terror.

Meanwhile...
Back in the Savage Land, Agent Townsend is informed that although the refrigeration units are operating at peak capacity but are still unable to abate the melting glaciers. As they discuss what to do next none are aware that within the melting glacier is the form of Stegron the Dinosaur Man. While back in the village of the Fall People, Spider-Man and Ka-Zar are working together to evacuate the villagers to higher ground. Ka-Zar explains that SHIELD is not helping with the evacuation because the Fall People do

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