Genesis 6:4 describes 'giants in the earth in those days,' offspring of the 'sons of God' and human daughters, and this film treats that verse as a historical claim worth testing. Narrator David McCallum, known to television audiences from NCIS, guides viewers through fossil records, archaeological finds, and biblical and other ancient manuscripts that the film's researchers present as evidence for oversized humans in the deep past. Forensic reconstructions and biomechanical comparisons to modern human physiology are used to sketch what these figures might have looked like and how their bodies could have functioned. The film also surveys giant legends across cultures, from folklore to religious texts, treating the recurrence of the theme as corroboration rather than coincidence. Its central question stays fixed on the 'sons of God' passage: who they were, where they came from, and whether the biblical account describes something literal. The presentation favors assertion over peer-reviewed sourcing, and viewers should weigh the claims against mainstream archaeology and paleoanthropology, which do not support the film's conclusions.