The boy known as "Ghost" was the prehistoric Ghost Rider, and a member of the Avengers of 1,000,000 BC.
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History
The young man who came to be the first Ghost Rider lived on Earth about a million years ago as part of a group of cavemen. At early age, he realized he was smarter than the rest of his pack, a fact he kept to himself out of fear of being isolated. One day, a mysterious man approached the pack and quickly became the leader by violent means. Eventually, the stranger revealed himself to be a Wendigo and devoured the entire pack save for the young boy. Before leaving, the man gave the boy the name "Ghost" and challenged the boy to find him. With everyone he had ever known gone, the boy chose to venture out beyond his cave, convinced that if the stranger could survive then so could he.
Eventually, Ghost grew exhausted due to the harsh environment. It was then Ghost was approached by Mephisto, in the form of a snake, who convinced him to say the snake's real name as a way to achieve his goal. Ghost was then bonded to a Spirit of Vengeance, and befriended a mammoth right after his transformation.
Five years later, Ghost finally tracked down the Wendigo to exact his revenge and engaged him in an intense fight. The fight ended with the Wendigo pushing Ghost's mammoth off a cliff with him, though the Wendigo claimed that he would survive the fall, but wondered if the Rider could survive the loneliness now that his mammoth friend was gone. The Rider was then approached by Odin and Lady Phoenix, who asked him to join the prehistoric Avengers.