THOR (1962) #228

Who was Ego before he was a Living Planet? Thor enters the dark recesses of Ego’s mind…and surely wishes he hadn’t. At the request of Galactus, Thor teams up with Firelord and Hercules to battle Ego, an ancient sentient planet that destroys everything in its path. During the battle toward its « brain » Thor is absorbed into its mind and experiences first-hand the last hours of the people who used to live on this planet, before their sun had gone nova. Thor relives the memories of a scientist named Egros. To save his people he had devised « Progject Worldcore. » They had tunneled to the core of the planet and made chambers where the people would sleep until the planet was livable again.…