Caleb keeps finding a symbol revealed by his brother, Jack, in a video he had prepared for his own son.It was a simple petroglyph, but Jack had offered no explanation, only that he had found the symbol in several ancient sites, mostly in North and South America, and thought it might be a clue to find the portal that led to his home.What is the tie between the one Jack found on Earth and the one Caleb is staring at on an unknown planet which was definitely not their birth planet?
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