Fantastic Four (1961) 173-A

"Counter Earth Must Die -- At the Hands of Galactus!"

Galactus starts his energy conversion process as the FF and the High Evolutionary fight to save Counter-Earth. They manage to delay Galactus enough that he issues a challenge to the group. They have 24 hours to find a suitable planet for him to devour, but the world must be populated and willing to sacrifice their world to Galactus. Three such worlds are chosen as Reed and Ben search the first world only to find out that it is inhabited by Torgo, the living robot that Ben had to fight against on the Skrull gangster world. They are not willing to sacrifice themselves as Reed and Ben are taken prisoner. Meanwhile, Gorr and Johnny go to investigate the second world, a world that appears to be medieval. Gorr and Johnny are taken captive by a knight who was trying to save a princess from a fire breathing dragon.