Koenig and a rescue party barge in, collect Sandra and Carter, and quickly withdraw. Led by the shrieking cave-wife, the cavemen pursue. Consumed by blood-lust, they are easily decoyed to the mysterious ravine, where Koenig and Bergman have prepared an ambush. Knowing the answer must lie within the mist, they fire repeated near-misses at the cave-people to drive them into it. The cave-wife is the last to enter. As the vapour engulfs her, she peers at Koenig with recognition and utters her first intelligible word—"John." Going round to the other side, Koenig watches as restored Alphans, led by Helena, emerge from the mist.