Issue #15 - Prisoners of the Mysterious Master Mold

Searching for the unhuman sentinels who were built by Dr. Bolivar Trask for the purpose of finding and destroying mutants, the X-Men stumble onto the sentinels' hidden fortress! And then, while the fanatical Dr. Trask is a prisoner of his own monstrous sentinels (who have rebelled against his authority), the X-Men's deadly ordeal begins...