"Back to the Stone Age" is a science fiction novel written by Edgar Rice Burroughs, first published in 1937. The story follows the adventures of radio operator Lieutenant O-220 and his companions, who find themselves transported to a prehistoric world through a strange phenomenon. In this primitive land, they encounter a variety of challenges, from battling ferocious beasts to navigating unfamiliar terrain. Burroughs weaves a tale of survival and discovery as the characters adapt to their new surroundings, facing both the wonders and dangers of a world lost in time. The novel explores themes of adaptation, courage, and the resilience of the human spirit in the face of the unknown.