X-Men (1963) #116
"To Save the Savage Land" is written by Chris Claremont with John Byrne and Terry Austin art. Once, the Savage Land was a prehistoric paradise sheltered from the ravages of the Antarctic by awesome geothermal forces. But now Garokk, the Petrified Man and self-proclaimed Sun God, has stolen that primal energy for himself and to build a great citadel, exposing the Savage Land to the ice and snow outside. Aided by the lovely but dangerous Zaladane, Garrok subjugates the freemen of the Savage Land to do his murderous bidding. Spear-wielding warriors set out after the X-Men on pterodactyls with a mission from Garokk: bring in the mutants and Ka-Zar so they can be made an example of.
Soon Cyclops, Colossus, Banshee and Ka-Zar fall prey to the nightmarish cavalry and are taken inside the domed megapolis for public execution. Wolverine, Storm and Nightcrawler know they are next. After Logan sends Ka-Zar's pet sabertooth Zabu to get help, the trio of mutants bravely enters the coldest, darkest reaches of Garokk's fortress. During the journey, Storm and Nightcrawler learn that their comrade, Wolverine, possesses both a tender side and a savage side that makes him more akin to the jungle cat than to a human being. Together, they free their teammates and bring the house down, literally, as Cyclops matches his eye-beams to those of the self-styled Sun God. Can the Savage Land survive their conflict?